answer: 54x^2 - 330x - 336
step by step explanation:
6 (x-7) x (9x+8)
distribute 6 through the parentheses
(6x - 42) x (9x+8)
multiply the parentheses
54x^2 + 48x - 378x -336
collect like terms
54x^2 - 330x - 336
and thats your answer
hope this helps you :)