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f(x)=a(x-x₁)(x-x₂) x₁=3, x₂=-5
f(x)=a(x-3)(x+5) podstawiamy współrzędne pkt(-4,-42)
-42=a(-4-3)(-4+5)
-42=a(-7)(1)
-7a=-42/:(-7)
a= 6
f(x)=a(x-3)(x+5)=6(x²+5x-3x-15)= 6(x²+2x-15)=6x²+12x-90
a=6 b=12 c= -90