Suppose that α, β and γ are the roots of the cubic equationx3 − 4x2 + 3x + 1 = 0.Find the cubic equation whose roots are α2 , β2 and γ2
Question
Suppose that α, β and γ are the roots of the cubic equation .
Find the cubic equation whose roots are and
Solution
The roots of the given cubic equation are α, β, and γ. We know that the sum of the roots taken one at a time, the sum of the roots taken two at a time, and the sum of the roots taken three at a time are given by the coefficients of the equation.
For the equation x^3 - 4x^2 + 3x + 1 = 0, we have:
- α + β + γ = 4 (from the coefficient of x^2)
- αβ + βγ + γα = 3 (from the coefficient of x)
- αβγ = -1 (from the constant term)
We want to find the cubic equation whose roots are α^2, β^2, and γ^2. Let's denote these roots as a, b, and c respectively. We know that:
- a + b + c = α^2 + β^2 + γ^2
- ab + bc + ca = α^2β^2 + β^2γ^2 + γ^2α^2
- abc = α^2β^2γ^2
We can find these values using the equations from the original cubic equation:
- α^2 + β^2 + γ^2 = (α + β + γ)^2 - 2(αβ + βγ + γα) = 4^2 - 2*3 = 10
- α^2β^2 + β^2γ^2 + γ^2α^2 = (αβγ)^2 = (-1)^2 = 1
- α^2β^2γ^2 = (αβγ)^2 = (-1)^2 = 1
So, the cubic equation with roots α^2, β^2, and γ^2 is x^3 - 10x^2 + x - 1 = 0.
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