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aratati ca 4(x+5)^2- (x+3)^2=(x+&)(3x+13)

Răspuns :

4x^{2}+40x+100- x^{2} -6x-9=3 x^{2} +13x+21x+91=>
=>3 x^{2} +36x+91=3 x^{2} +34x+91=>
=>3 x^{2} -3 x^{2} +36x-34x=91-91=>
=>2x=0=>x=0