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Ak0nyaaa

Ответ:

7x^2+x-8=0

D=(-1)^2-4*7*(-8)=1+4*7*8= 225= 5^2

x1=(-1)-5/2=(-6)/2=(-3)

x2=(-1)+5/2=4/2=2

Ответ: x1=-3; x2=2

А остальное можешь решить через photomath

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