Question

Simplify 8 m (6n +4) -12 and find its value for m=1 and n=-1

Answer 1

8 m (6n +4) -12=8m*6n+8m*4-12=48mn+32m-12

48*1*(-1)+32*1-12=-48+32-12=-28

Answer 2

`8m(6n + 4) - 12 \\ 48mn + 32m - 12 \\ - 48 + 32 - 12 \\ = - 28`