expand and simplify (2x²+3)(4x+5)-8x(x²-2)
My steps: (2x²+3)(4x+5)=8x³=10x²+12x+15
-8x(x²-2)= -8x³+16
(8x³+10x²+12x+15)-8x(x²-2)
(8x³+10x²+12x+15)-8x³+16x
10x²-28x+15
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