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Given, quadratic polynomial is f(x) = x2 - px + q
Now, α and β are the zeroes of the polynomial.
So, α + β = -(-p)
=> α + β = p
and α * β = q
Now, α2 + β2 = (α + β)2 - 2 *α * β
=> α2 + β2 = p2 - 2 *q
=> α2 + β2 = p2 - 2q