If alpha and beta are the zeros of th polynomial f(x) =x^2-px+q, find the value of alpha square + beta square
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α²+β² = (α-β)²+2αβ
⇒(-b/a)² + 2×c/a
⇒(-p/1)² + 2×q/1
=p²+2q²
⇒(-b/a)² + 2×c/a
⇒(-p/1)² + 2×q/1
=p²+2q²
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