Question

I was supposed to simplify 3x (x² - x - 2) + 2x (3 - x) - 7x, I had trouble and asked tutor who gave me 3x³ - 5x² - 7x. Then I went back to answer the question and the answer choices were:x² - 12x - 6x² - 4x - 69x² - 12x - 69x² - 4x - 6I'm wondering if maybe 3x³ - 5x² - 7x simplifies somehow into one these choices or if there was mistake.

Answer 1

Let's simplify the expression:

3x (x² - x - 2) + 2x (3 - x) - 7x=

3x³ - 3x² -6x +6x -2x² -7x =

3x³ -5x²-7x.