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f(x) = a(x + 5)(x - 2)
Podstawiamy współrzędne punktu P za x i y
a(4 + 5)(4 - 2) = -9
a * 9 * 2 = -9
18a = -9
a = 2
f(x) = 2(x + 5)(x - 2)
f(x) = 2(x² - 2x + 5x - 10)
f(x) = 2(x² + 3x - 10)
f(x) = 2x² + 6x - 20
a = 2
b = 6
c = -20