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f(-8) = 0, f(- 13 ) = 0, f( - 3) = 150
f(x ) = a*( x+13)*( x+8)
f(-3) = a*(-3 +13)*(-3 + 8) = a *10*5 = 50 a = 150
50 a = 150
a = 3
f(x) = 3*(x +13)*(x +8) = 3*(x² + 8x + 13x + 104) =
= 3 x² + 63 x + 312
Odp. a = 3, b = 63 , c = 312
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