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Calculati : (2x+3)(2x-3)
Dau coroana !!!!


Răspuns :


(2x)la a 2 - 3 la a 2 = 4x la a 2 -9
4x la a 2 = 9
x la a 2 = 9/4
x = radical 9/4
(2x+3)(2x-3)=2x*2x+2x*(-3)+3*2x+3*(-3)=4x^2-6x+6x-9=4x^2-9