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If lamda1, lamda2 (lambda1 > lambda2) a...

If `lamda_1, lamda_2 (lambda_1 > lambda_2)` are two values of `lambda` for which the expression `f(x,y) = x^2 + lambdaxy +y^2 - 5 x - 7y + 6` can be resolved as a product of two linear factors, then the value of `3lamda_1 + 2lamda_2` is

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