Find the derivative and simplify. y (9x + 6)(x² - 4x). Step 1 We want to find y' if y= (9x + -Select- O Rule. Be sure to y'=(9x+6) Submit 6)(x2 - 4x). Since y is a product of two separate functions, we can find y' by using the simplify the result. ])+(x² - 4x) ([ x + 12x- -36x Skip (you cannot come back) + 9x²