Răspunsuri

2014-05-31T16:52:51+03:00
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