Question

Is x = –4 a valid solution this linear equation?
2x + 9(x – 1) = 8(2x + 2) – 5​

Answer 1

2x + 9(x-1)=8(2x + 2) - 5
2x +9x -9 = 16x + 11
11x - 9 = 16x + 11
11x = 16x + 20
-5x = 20
x = -4

Yes!

Answer 2

Yes it is!

Explanation:

All you have to do is plug in -4 in place of all the x’s. You should get

-8x - 36 - 9 = -64x + 16 - 5

Simplified: -8x - 45 = -64x + 11

+45. + 45

-8x = -64x + 56

+64 +64

56 = 56

Answer = True

So yes -4 is a correct solution!