Question

|7x + 7| = 56

A. x = 7 or x = -9

B. x = -7 or x = 9

C. x = 5 or x = -8

D.x = -5 or x = 8

Answer 1

|7x + 7| = 56
\[(7x+7)^2=56^2 \\ \\ \text{Square both sides,} \\ \\ 49x^2+98x+49=3136 \\ \\ 49x^2+98x-3087=0 \\ \\ \text{Divide by 49,} \\ \\ x^2+2x-63=0 \\ \\ \text{factor,} \\ \\ (x-7)(x+9)=0 \\ \\ \text{Solve}\]

Answer 2

idk how to do this math im home schooled and in 5th i cant do this math

Answer 3

http://openstudy.com/study#/updates/503cf88be4b04bebe0425b57

Answer 4

Where you don't understand?