Ответ:
7у²+21у-(у+3)=0
7у²+22у-3=0
D=484-4*7*(-3)=400
х1/2=(-22+-20)/14
х1=-3
х2=(-1/7)
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Ответ:
7у²+21у-(у+3)=0
7у²+22у-3=0
D=484-4*7*(-3)=400
х1/2=(-22+-20)/14
х1=-3
х2=(-1/7)