Answer:
A - x3- 2x2- 17x - 18
Step-by-step explanation:
(x+2)(x2−4x−9)
=(x+2)(x2+−4x+−9)
=(x)(x2)+(x)(−4x)+(x)(−9)+(2)(x2)+(2)(−4x)+(2)(−9)
=x3−4x2−9x+2x2−8x−18
=x3−2x2−17x−18
➷ (x + 2)(x^2 - 4x - 9)
= x^3 - 4x^2 - 9x + 2x^2 - 8x - 18
Simplify it to:
x^3- 2x^2 - 17x - 18
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