Question

PLEASE HELP ME ITS DUE REALLY SOON PLZZZZ

CAN YOU TELL ME IS I DID 2,3 right if not can you plzzzzzz help

Answer 1

1) 5x + 4x²(2x + 7) - 6x² - 9x

= 5x + 8x³ + 28x² - 6x² - 9x

= 8x³ + 22x² - 4x

2) the answer is 2x³ + 17x² + 25x - 50

3) the answer is y = 4x² + 14x + 18