7-6х-х² =0
х²+6х-7=0
D= 36+28=64
x₁=(-6+8)/2= 1
x₂=(-6-8)/2= -7
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7-6х-х² =0
х²+6х-7=0
D= 36+28=64
x₁=(-6+8)/2= 1
x₂=(-6-8)/2= -7