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F(x)=-(x²+10x+25)+9
F(x)=-x²-10x-25+9
F(x)=-x²-10x-16
Δ=100-64=36
√Δ=6
x₁=-8
x₂=-2
y=-(x+2)(x+8)
F(x)=-(x²+10x+25)+9
F(x)=-x²-10x-25+9
F(x)=-x²-10x-16
Δ=b²-4ac
a=-1
b=-10
c=-16
Δ=(-10)²-4*(-1)*(-16)=100-4*16=100-64=36
√Δ=6
x₁=(-b-√Δ)/2a=(-(-10)-6)/(-2)=(10-6)/(-2)=4/(-2)=-2
x₂=(-b+√Δ)/2a=(-(-10)+6)/(-2)=(10+6)/(-2)=16/(-2)=-8
y=a(x-x₁)(x-x₂)
y=-1(x-(-2)) (x-(-8))
y=-(x+2)(x+8)