-2x(8-x)-5(x²+3x)=-16x+2x²-5x²-15x=2x²-5x²-16x-15x=-3x²-31x
-3x²-31x=-3·(-2)²-31·(-2)=3·4-(-62)=12+62=74
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-2x(8-x)-5(x²+3x)=-16x+2x²-5x²-15x=2x²-5x²-16x-15x=-3x²-31x
-3x²-31x=-3·(-2)²-31·(-2)=3·4-(-62)=12+62=74