Step 1: Identify the given information for the cubic polynomial.
Let the zeroes of the cubic polynomial be α,β,γ.
The general form of a cubic polynomial is P(x)=ax3+bx2+cx+d.
The relationships between the zeroes and coefficients are:
Sum of zeroes: α+β+γ=−ab
Sum of the product of zeroes taken two at a time: αβ+βγ+γα=ac
Product of zeroes: αβγ=−ad
From the problem statement:
Sum of zeroes =−2
Sum of the product of its zeroes taken two at a time =7
Product of its zeroes =16
Step 2: Set up the equations based on the given values.
We can assume a=1 to find a cubic polynomial.
So, we have:
−1b=−2⟹b=2
1c=7⟹c=7
−1d=16⟹d=−16
Step 3: Form the cubic polynomial.
Substitute the values of a,b,c,d into the general form P(x)=ax3+bx2+cx+d.
P(x)=1x3+2x2+7x−16
P(x)=x3+2x2+7x−16
The cubic polynomial is x3+2x2+7x−16.