Question

Giúp mình với

x(x-5)(x+5)-x(x^2-4x)=20

Answer 1

x(x-5)(x+5)-x(x²-4x)=20

x²-5x(x+5)-x(x²-4x)=20

x³+5x²-5x²+25x-x³-4x²=20

x³-x³+5x-5x²-4x²-25x=20

-4x²-25x=20

Answer 2

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Answer 3

x(x-5)(x+5)-x(x²-4x)=20

x²-5x(x+5)-x(x²-4x)=20

x³+5x²-5x²+25x-x³-4x²=20

x³-x³+5x-5x²-4x²-25x=20

-4x²-25x=20