i alpha and beta are the zeroes ofthe quadratic polynomial f(x) = X2-px+q then find the value of alpha2 + beta 2

f(x) = x2-px+q

So, alpha + beta = -b / a = p

and, alpha x beta= c /a = q

So, alpha2+beta2 = (alpha+beta)2 - 2 (alpha x beta)

  = p2 - 2q

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