x(x-5)²-x(x-5)(x+5)
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x(x-5)²-x(x-5)(x+5)x(x-5)²-x(x-5)(x+5)x(x-5)²-x(x-5)(x+5)x(x-5)²-x(x-5)(x+5)=x[x
x(x-5)²-x(x-5)(x+5)
x(x-5)²-x(x-5)(x+5)
x(x-5)²-x(x-5)(x+5)
x(x-5)²-x(x-5)(x+5)=x[x²-10x+25-(x²-5²)]=x(x²-10x+25-x²+25)=-10x²+50x