5x(x的平方+2x+1)-(2x+3)(x-5)化简

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5x(x的平方+2x+1)-(2x+3)(x-5)化简
5x(x的平方+2x+1)-(2x+3)(x-5)化简

5x(x的平方+2x+1)-(2x+3)(x-5)化简
5x﹙x²+2x+1﹚-﹙2x+3﹚﹙x-5﹚
=5x³+10x²+5x-﹙2x²-10x+3x-15﹚
=5x³+10x²+5x-﹙2x²-7x-15﹚
=5x³+10x²+5x-2x²+7x+15
=5x³+12x²+12x+15

5x(x2+2x+1)-(2x+3)(x-5)
=(5x3+10x2+5x)-(2x2-7x-15)
=5x3+10x2+5x-2x2+7x+15
=5x3+8x2+12x+15.
我老师才讲过