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(x+3)^2-(x-√5)^2+3 va rog repede

Răspuns :

folosesti expresia (a+b)^2 = a^2+2ab+b^2

x^2+6x+9- (x^2-2V5x+5) = x^2+6x+9-x^2+2V5x-5 = 6x+2V5x+5 = 2x(3+V5)+5