Answer:
45x³-83x²-17x+56
Explanation:
(5x-7)(9x²-4x-8)
5x(9x²-4x-8) -7 (9x²-4x+56)
45x³-20x²-45x-63x²+28x+56
=5x(9x²-4x-8)-7(9x²-4x-8)
=45x³-20x²-40x-63x²+28x+56
=45x³-83x²-12x+56
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