find the cubic polynomial for the zeros 4, - 2, 1 / 2
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the polynomial for this zeros is of the form
f (x)=k(-x^3+(4-2+1/2)x^2-(-2×4+1/2×(-2)+1/2×4)x+(-2×4×1/2)=0
=>f (x)=-x^3+3/2x^2-7x-4
f (x)=k(-x^3+(4-2+1/2)x^2-(-2×4+1/2×(-2)+1/2×4)x+(-2×4×1/2)=0
=>f (x)=-x^3+3/2x^2-7x-4
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