An equation is shown below: 6x + 2x + 13 = 3x ? 12 part a: write the steps you will use to solve the equation. (4 points) part b: what value of x makes the equation true? (1 points)

x = -5

Step-by-step explanation:

6x + 2x + 13 = 3x-12

Combine like terms

8x+13 = 3x-12

Subtract 8x from each side

8x-8x+13 = 3x-8x-12

13 = -5x-12

Add 12 to each side

13+12=-5x-12+12

25 = -5x

Divide by -5

25/-5 = -5x/-5

-5 =x

3 is greater then both of those numbers

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!