х2+7х-1=0 х2-7х+1=0 х2-15х+56=0
х²+7х-1=0D=b²-4ac=72-4·1· -1=53х₁=0,1401х₂= -7,1401
х²-7х+1=0D=b²-4ac= -72-4·1·1=45х₁=6,8541х₂=0,1459
х²-15х+56=0D=b²-4ac=-152-4·1·56=1х₁=8х₂=7
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х²+7х-1=0
D=b²-4ac=72-4·1· -1=53
х₁=0,1401
х₂= -7,1401
х²-7х+1=0
D=b²-4ac= -72-4·1·1=45
х₁=6,8541
х₂=0,1459
х²-15х+56=0
D=b²-4ac=-152-4·1·56=1
х₁=8
х₂=7