if alpha and beta are zeroes of quadratic polynomial f(x) = x2 - ax +b , then find the value of alpha2 +beta2.

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(alpha + beta)2 =alpha2 + beta2 + 2*alpha*beta
(a)2 = alpha+ beta2 + 2*b 
alpha+ beta2 = a2/ 2b  
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just to correct you the final answer will be a2 - 2b and thank you for answering my query.
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