Answer
$5x^2+50x-16$
Work Step by Step
Use the FOIL method on the terms in the two sets of parentheses. Then combine like terms.
$(7x-3)(2x+8)-9x^2+8$
$=14x^2+56x-6x-24-9x^2+8$
$=5x^2+50x-16$
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