Question

What expressions are equivalent to 12x-42 (choose all that apply)

6(2x-7)
3(4x-39)
2(6x-21)
-2(-6x-40)

Answer 1

6(2x-7) and 2(6x-21)
Both equals to 12x-42
6*2x=12x & 6*(-7)=-42 –> 12x-42
2*6x=12x & 2*(-21)=-42 —> 12x-42