A polynomial function whose zeros are given :
x1 = -4
x2= 0
x3 = 5
we are told that it is a 3rd degree polynomial ;
so:
(x-x1)(x-x2)9x-x3)
= (x-(-4)) ( x -0) (x -5)
=(x+4) (x)(x-5)
= x(x+4)(x-5)
=x ( x^2 -x - 20)
= x^3 -x^2 -20x
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