Уравнение 7x^2+12x-4=0

Question

Уравнение 7x^2+12x-4=0

Answer 1

D=12^2-4×7×(-4)=144+112=256
x1=-12+16/2×7=4/14=2/7
x2=-12-16/2×7=-28/14=-2 

Answer 2

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