Question

Which expression is equivalent to

(x2 – 5x)(3x2 + 2x – 9)?

A. x2(3x2 + 2x) – 5x(2x – 9)
B. x2(3x2 + 2x – 9) – 5x(3x2 + 2x – 9)
C. x2(3x2 + 2x – 9) + 5x(3x2 + 2x – 9)
D. x2(3x2 + 2x – 9) – 5x

Answer 1

the answer is B :)

Answer 2

For this case we have the following expression:
(x2 - 5x) (3x2 + 2x - 9)
Rewriting we have:
(3x4 + 2x3 - 9x2) + (-15x3 - 10x2 + 45x)
3x4 - 13x3 - 19x2 + 45x
An equivalent expression is given by:
x2 (3x2 + 2x - 9) - 5x (3x2 + 2x - 9)
Answer:
B. x2 (3x2 + 2x - 9) - 5x (3x2 + 2x - 9)