Question

What is the value of -3|15 -s|+2s^3 when s=-3

Answer 1

$-3|15-s|+2s^3\\\\\text{substitute the value of s = -3 to the expression}\\\\-3\cdot|15-(-3)|+2\cdot(-3)^3=-3\cdot|15+3|+2\cdot(-27)=-3\cdot|18|-54\\\\=-3\cdot18-54=54-54=0$