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(X+1)(2x-1)
(-3x+2)(x-2)
(-3x-1)(4x-2)
(-5x+2)(-4x+3)
(X-2)(x la a 2 +2x+4)

Răspuns :

(x+1)(2x-1)=2x²-x+2x-1=2x²+x-1
(-3x+2)(x-2)=-3x²+6x+2x-4= -3x²+8x-4

(-3x-1)(4x-2)=-12x²+6x-4x+2=-12x²+2x+2

(-5x+2)(-4x+3)=20x²-15x-8x+6= 20x²-23x+6

(x-2)(x² +2x+4)=x³+2x²+4x-2x²-4x-8=x³-8

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