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Nikif5
a fost răspuns

(X-1) la a doua + (x-4)•(x+5) =??

Răspuns :

x²+2x+1+x²+5x-4x-20
2x²+3x-19
=xpatrat+ 2x+1+x(x+5)-4(x+5)= =xpatrat+2x+1+xpatrat+5x-4x-20= =2xpatrat+3x+1-20= =2xpatrat+3x-19

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