miejscami zerowymi funkcji y= -x(2) - 6x +7 sa liczby ?
y=-x²-6x+7 a=-1 b=-6 c=7
Δ=b²-4ac = 36 +28 = 64
√Δ=√64 = 8
x1 = (-b-√Δ)/2a=(6 - 8)/-2 = -2/-2 = 1
x2 = (-b+√Δ)/2a=(6 +8)/-2 = 14/-2 = -7
odp:
x=1 U x=-7
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y=-x²-6x+7 a=-1 b=-6 c=7
Δ=b²-4ac = 36 +28 = 64
√Δ=√64 = 8
x1 = (-b-√Δ)/2a=(6 - 8)/-2 = -2/-2 = 1
x2 = (-b+√Δ)/2a=(6 +8)/-2 = 14/-2 = -7
odp:
x=1 U x=-7