x^2(2x+5)-2(2x+5)=(2x+5)(x^2-2)=(2x+5)(x-pierwiastek z 2)(x+pierwiastek z 2)
2x³+5x²-4x-10=
2x³-4x+5x²-10=
2x(x²-2)+5(x²-2)=
(2x+5)(x²-2)
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x^2(2x+5)-2(2x+5)=(2x+5)(x^2-2)=(2x+5)(x-pierwiastek z 2)(x+pierwiastek z 2)
2x³+5x²-4x-10=
2x³-4x+5x²-10=
2x(x²-2)+5(x²-2)=
(2x+5)(x²-2)