find the cubic polynomial whose zeroes are 5,3 and -2.
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f(x) = x³ - (sum of the root)x² + (product of root two at a time)x - product of root all at a time
f(x) = x³ -(5+3-2)x² +(5*3-5*2-2*3)x - 5*3*(-2)
f(x) = x³ -6x² -x + 30
f(x) = x³ -(5+3-2)x² +(5*3-5*2-2*3)x - 5*3*(-2)
f(x) = x³ -6x² -x + 30
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