Mathematics College

What did I forget to do in this question? What should the answer be?
Use only Quadratic Formula

[tex] {7x}^{2} + 9x + 2 = 0[/tex]
[tex] {x}^{2} + 9x + 14 = 0[/tex]
[tex](x + 7)(x + 2) = 0[/tex]
x= -7,x=-2​

Answers

Answer 1

The mistake is in the first step. You seem to want to divide through by 7, but you only did it correctly with the x ² term. What you should have after doing this is

7x ² + 9x + 2 = 0

→   x ² + 9/7 x + 2/7 = 0

This step isn't actually necessary to begin with since the starting quadratic is easily factorized:

7x ² + 9x + 2 = (7x + 2) (x + 1) = 0

Then

7x + 2 = 0   or   x + 1 = 0

7x = -2   or   x = -1

x = -2/7   or   x = -1

Related Questions

Help help help help

Answers

The answer is 4. 2x plus 7 is equal to 15. First you subtract 7 from both sides then divide by 2 to get the answer 4. Hope this helps!

Two different formulations of an oxygenated motor fuel are being tested to study their road octanenumbers. The variance of road octane number for formulation 1 is ı2 = 1.5, and for formulation, 2it is ı2 = 1.2. Two random samples of size n1 = 15 and n2 = 20 are tested, and the mean roadoctane numbers observed are x1 = 89.6 and x2 = 92 5. Assume normality. Find the 95%confidence interval for the difference in the mean octane number.

Answers

Answer:chomai

Step-by-step explanation:chomai

The new TCL LED TV at Best Buy is regularly $299.



a) You have a 25% coupon. What is the sale price after the discount? $




b) What is the total purchase price if sales tax is 8.5%? $

Answers

a) $224.25
b) $243.31

Answer:

1) 224.25

2) 243.31

Step-by-step explanation:

what expression is equivalent to 2(x-4)+x

Answers

Step-by-step explanation:

2(x-4) + x

= 2x-8 + x

= 3x - 7

The radius of a circleIs 3 inches what is the circles area

Answers

Answer:

28.27

Step-by-step explanation:

area of circle: πr^2

π(3)^2

=9π = 28.27

please help , thank youu

Answers

Answer:

9.) would be 89 and 10.) would be 1500 ft

Answer:

A. 89 B. 1200 ft

Step-by-step explanation:

A.

5(-4²)+9

5(16)+9

80+9

89

B.

-150+1350=

1200

ayuda plis es para hoy.​

Answers

Answer:

8.29

Step-by-step explanation:

Cada linea representa ,1

y como es la ultima linea de las 9 antes del 8,3 la respuesta es 8.29

The Lcm of 4,9 what is that

Answers

Answer:

36

Step-by-step explanation:

Answer:

36

Step-by-step explanation:

Find the diameter of a circle with circumference 44 cm​

Answers

Let the diameter be d cm
As we know that
Circumference of circle with diameter d is πd
Given Circumference of a circle is 44 cm
⟹πd=44
⟹
7
22
​
×d=44
⟹d=
22
44×7
​
=14
So the diameter is 14 cm

Answer:

14cm

Step-by-step explanation:

just so u know all u gotta ddo to findd the diameter is divide it by 3.14 i think

hey guys i need some help on this division problem i have

Answers

Answer:

3. 25/28

4. 1 1/7

Step-by-step explanation:

when you divide fractions just flip one of them and then multiply across

so instead of 5/7 ÷ 4/5 its

5/7 • 5/4

please mark me brainliest to help me get ace rank

find the surface of the rectangular prism ​

Answers

Answer:

The surface of the rectangular prism is 42

l × w × h

The length is 3 width is 2 and the height is 3.

Hope this helps have an awesome day❤

3 Convert 6,23 kg to grams​

Answers

Answer:

6230 grams xD

Step-by-step explanation:

6230 grams..

( it says i have to write 20 letters so i just did this)

Plz help meeee! I need help on this math problem!

Answers

The answer to this is 26


There are 1,000 meters in 1 kilometer. How many kilometers are in 3,600 meters?


HELP

Answers

Answer:

A. 3.6 kilometers

Step-by-step explanation:

1000 meters = 1 km

3600 meters = x km

Set as a ratio:

1000 : 1 = 3600 : x

Then divide:

[tex]\frac{3600}{1000} = \frac{x}{1} = x[/tex]

so 3600/1000 = 3.6 = x

3.6 km

What is the answer I need to know

Answers

Answer:

Arrange your numbers in numerical order.

Count how many numbers you have.

If you have an odd number, divide by 2 and round up to get the position of the median number.

If you have an even number, divide by 2. Go to the number in that position and average it with the number in the next higher position to get the median.

Solve For X (I could use some help because I'm confused on this)​

Answers

Answer:

X=10

Step-by-step explanation:

The arc is twice the angle, so 130.

12x+10=130

12x=130-10

12x=120

x=10

Maria wanted a sewing needle that had the smallest diameter. Which needle diameter is the smallest?

0.101 in
0.011 in
0.11 in
0.001 in

Answers

0.001 hope this helps

You are visiting the rainforest, but unfortunately your insect repellent ran out. As a result, at each minute, with probability 0.5, one mosquito lands on your neck, and with probability 0.5, no mosquito lands. If a mosquito lands, it will bite you immediately with probability 0.2, or leave immediately with probability 0.8. a) What is the expected time between successive bites

Answers

Answer:

we will assume a variable X for time which is time between two successive bites and time until next bite.

X = (time between successive mosquito bites) = (time until the next mosquito bite).

According to the Bernoulli process, the bites occur parameter y = (0.5)(0.2) = 0.1.

X is a geometric random variable, so

E[X] = 1/p = 10

and

var(X) = (1 − p)/p^2 = (1 - 0.1)/0.1^2 = 0.9 / 0.01 = 90

Help fast please....

Answers

Answer:

46 yd²

Step-by-step explanation:

how do you get a letter in math to a number

Answers

Answer:

You need to the value of the letter "variable."

Step-by-step explanation:

Answer:

Huh? Can I get more details?

Step-by-step explanation:

Which relation is a function?

A. {(0, 1), (0, 2), (1, 2), (1, 3)}
B. {(8, 1), (4, 1), (0, 1), (–15, 1)}
C. {(–2, –12), (–2, 0), (–2, 4), (–2, 11)}
D. {(–4, –6), (–3, –2), (1, –2), (1, 0)}

Answers

a is a function
expiation:

) Jess has saved dimes ($ 0.10) and quarters ($ 0.25) in their piggy bank. Define the variables and write a
system of equations to determine the number of dimes and quarters if they have 25 coins worth $4.00
in total. Then solve the system using the best method for the situation.

Answers

Answer:

Quarters = 10

Dimes = 15

Step-by-step explanation:

d = number of dimes, q = number of quarters

d + q = 25 is the equation for number of coins

0.1d + 0.25q = 4 is the equation for value of coins

First, solve for d in terms of q:

d + q = 25

d = 25 - q

Then substitute that into the other equation:

0.1(25 - q) + 0.25q = 4

2.5 - 0.1q + 0.25q = 4

0.15q = 1.5

q = 10

And back to d = 25 - q, d = 25 - 10 = 15

Check the math:

0.1(15) + 10(0.25) = 1.5 + 2.5 = 4

LMK if you have questions


Of the 60 books on a bookshelf,24 are non-fiction.what percent of the books are non fiction.
fiction?

Answers

40% of the books are non-fiction
(24/60)(100%)= 40%

Juliette ate 1/3 of a cake, and Brad ate 3/8 of the same cake. What fraction of the cake was eaten?

Answers

Answer:

17/24

Step-by-step explanation:

Find common denominators...

1/3 = 8/24

3/8 = 9/24

Now add...

17/24 of the cake was eaten

Hope this helps :)

Select the expression that shows the next step for the following division
problem:
11 유는
x
6
a.
b.
5
11
5
d.
11
O a.
ob.
O d.

Answers

it would be a because you want to multiply by a reciprocal

How do you find the fraction between 9/5 and 10/5?

Answers

Answer:

Step-by-step explanation:

to do something like this, you could just multiply both sides by 2. So now, you have 18/10, and 20/10. The one in between that would be 19/10

Dunkin Donuts sold 1,600 drinks in one day. Of those drinks, 87.5% of them were coffee . How many of the drinks were coffee?

Answers

Answer: 1400 is coffee.

Step-by-step explanation:


Find the product of the following:

3.57 and 8.1
Pls help I’m being timed!!!!

Answers

Answer:

28.917

Step-by-step explanation:

i multiplied the two numbers

Hiiiiiiii aoapwbcnalokdjxnowicosbwnw

True or False.

The expressions 3+y and 13(6+y) are equivalent?



True

False

Answers

Answer:

False

Step-by-step explanation:

Brainliest please?

PLSS ANSWEER ILL GIVE BRAINLIEST
pls explain how to solve the equasion.

Answers

Answer:

there does not seem like a picture so I dont know the answer

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