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(x+2)(x+3)-5 (x-1)=(x-1)²+6


Răspuns :

x la 2+5x+6-5x+5=x la 2 -2x+1+6
x la 2 +11=x la 2 -2x +7
2x=7-11
2x=-4
x=-2
(x+2)(x+3)-5 (x-1)=(x-1)²+6
x^2 + 3x + 2x + 6 - 5x + 5 = x^2 - 2x +1 + 6 
x^2 + 5x - 5x - x^2 + 2x = 7 - 11 
2x = - 4 
x = -4 : 2 
x = - 2