Question

Simplify.

(x−3)(x2−4x−7)




x3+x2−5x−21

x3−3x2+12x+21

x3−7x2+19x+21

x3−7x2+5x+21

Answer 1

c.

Explanation:

(x-3)(x²-4x-7)=x(x²-4x-7)-3(x²-4x-7)=x³-4x²-7x-3x²+12x+21=

=x³+(-4x²-3x²)+(-7x+12x)+21=x³-7x²+5x+24