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3 years ago

Factor completely. 28 – 7x2

Mathematics

1 answer:

coldgirl [10]3 years ago

5 0

Answer:

7(2+x)(2-x)

Step-by-step explanation:

Both terms are perfect squares,use the difference of square formulas

a^2-b^2=(a+b)(a-b) where a=2 and b=x

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you my kids is doing 4 grade math i didnt go to school for all the years but are they doing in 4 grade

Allisa [31]

Answer:

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Step-by-step explanation:

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3 years ago

A store owner purchases thirty 75-watt light bulbs and 40 fluorescent light bulbs for a total cost of $95. A second purchase, at

N76 [4]

Answer: 75-watt are 30$ fluorescent are 30$ in the second and 65$ in the first

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3 years ago

1. 3x + y = 11 5x - y = 21

sergeinik [125]

Answer:

[4, -1]

Step-by-step explanation:

Using the Elimination Method:

3x + y = 11

5x - y = 21

__________

8x = 32

__ ___

8 8

x = 4 [Plug this back into both equations to get the y-coordinate of -1]; -1 = y

The y's are already additive inverses [result in 0], canceling each other out.

I am joyous to assist you anytime.

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3 years ago

What is the value of x?

Nastasia [14]

Answer:x=15

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

HELP ME OUT PLEASE I RLLY NEED IT ASAP. ):

LenaWriter [7]

(a) Slope is rise over run, or change in y over change in x.

1 -> 3 ( $\frac{y_{2}-y_{1}}{x_{2}-x_{1}} = \frac{4 - -8}{-1 - -5} = \frac{4 + 8}{-1 +5}= \frac{12}{4} =\frac{12}{4}$ )

2 -> 3 ( $\frac{y_{2}-y_{1}}{x_{2}-x_{1}} = \frac{1 - 7}{0 - 2} = \frac{-6}{- 2} =\frac{6}{2}$ )

3 -> -1/3 ( $\frac{y_{2}-y_{1}}{x_{2}-x_{1}} = \frac{-7 - -3}{6 - -6}= \frac{-7+3}{6+6}=\frac{-4}{12}=-\frac{1}{3}$ )

(b) If a line is parallel, the slopes will be the same. If they are perpendicular, the slopes will be are negative reciprocals of one another. If they are neither, then their slopes don't match up in any way.

1 & 2 -> Parallel

1 & 3 -> Perpendicular

2 & 3 -> Perpendicular

Note - Since 1 & 2 are parallel, then both 1 and 2 will be perpendicular to 3!

Have a nice day!

If this is not what you are looking for - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather

5 0

3 years ago

Read 2 more answers