Tuesday

September 1, 2015
Posted by **John** on Tuesday, October 5, 2010 at 5:32pm.

- Algebra -
**Henry**, Tuesday, October 5, 2010 at 10:01pm[4x - 4] = 8x + 16.

There are 2 possible solutions:

4x - 4 = +- (8x + 16),

First Eq:

4x - 4 = +(8x + 16),

4x - 8x = 16 + 4,

-4x = 20,

x = -5.

2nd Eq:

4x - 4 = -(8x + 16),

4x - 4 = -8x - 16,

4x + 8x = -16 + 4,

12x = -12,

x = -1.

Check 1st Eq:

[4*-5 -4] = 8*-5 + 16,

[-24] = -24.

The above statement is NOT true:

[-24] = +24.

Therefore, -5 is NOT a solution.

Check 2nd Eq:

[4*-1 - 4] = 8*-1 + 16,

[-8] = 8. TRUE.

Solution:x = -1.