Question

Which of the following values is a solution of 3|5 + x| = 12?

A. 7

B. 1

C. –17

D. –9

Answer 1

\[\left| 5+x \right|=\frac{ 12 }{ 3 }=4,5+x=\pm4,\]
5+x=4
x=4-5=-1
5+x=-4
x=-4-5=-9