Question

Simplify (x + 2)(x2− 4x − 9).

Ax3− 2x2− 17x − 18
Bx3− 6x2− x − 18
Cx3− 4x2− 3x − 18
D x3− 10x2− 9x − 18

I feel like it's C

Answer 1

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➷ (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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Answer 2

A - x3- 2x2- 17x - 18

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