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Descompuneti (x+1)la a doua -(2x-3)la a doua

Răspuns :

x la a doua + 2x+1
-(4x la a doua -12x+9)= -4x la a doua +12x-9. 
x^2+2x+1-(4x^2-12x+9)=x^2+2x+1-4x^2+12x-9=-3x^2+14x-8. (^2 inseamna la puterea a doua)