Question 172558
1. Evaluate for a = 3 and b = -4
a) {{{(2b)^3 = (2(-4))^3}}}={{{(-8)^3 = (-8)(-8)(-8)}}} = {{{highlight(-512)}}}
b) {{{-ab^2(a-ab) = -3(-4)^2(3-3(-4))}}}={{{-3(16)(3-(-12)) = -48(15)}}}={{{highlight(-720)}}} 
c) {{{-a-b^2-5 = -3-(-4)^2-5}}}={{{-3-16-5 = highlight(-24)}}}
d) {{{-2(ab)^2 = -2(3(-4))^2}}}={{{-2(-12)^2 = -2(144)}}}={{{highlight(-288)}}}
2. Combine like-terms.
a) {{{-5w+9x-8w-4x = -5w-8w+9x-4x}}}={{{highlight(-13w+5x)}}}
b) {{{-4+5y+(-3)+5y+4y = -4+(-3)+5y+5y+4y}}}={{{highlight(-7+14y)}}}