Jika a× b=x pangkat2 +6x-16 dan a×c=x pangkat2 - x-2, hasil b × c =...

a x b = x^2 + 6x - 16
b = (x^2 + 6x - 16) ÷ a
a x c = x^2 - x - 2
c = (x^2 - x - 2) ÷ a
b x c =( (x^2 + 6x - 16) ÷ a) x ((x^2 - x - 2) ÷ a)
=x^4 - x^3 -2x^2 + 6x^3 - 6x^2 - 12x - 16x^2 + 16x + 32
=x^4 - x^3 + 6x^3 - 2x^2 - 6x^2 - 16x^2 + 12x + 16x + 32
=x^4 + 5x^3 - 24x^2 + 28x + 32