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

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)
 
 B. x2 (3x2 + 2x - 9) - 5x (3x2 + 2x - 9)

I'm just guessing, but my answer would c. 0 to 300.