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X1 + X2 = 5
X1 . X2 = 5/2
X1/X2 + X2/X1 = ?
= X1^2+X2^2 / X1 . X2
= (X1 + X2)^2 - 2 (X1 . X2) / X1 . X2
= 5^2 - 2 . 5/2 / 5/2
= 25 - 5 / 5/2
= 20 / 5/2
= 8