(2x-1)^2-4(x+3)^2 ex.4 vă rog.
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Răspuns:
(2x la a 2 - 2 ori 2x +1 la a doua)-(x la a doua + 2 ori x ori 3 + 3 la a doua)=2x la 2 -4x+1-x la 2-6x-9=x la 2-10x-8