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If x 2 – 15x + 51 = 0, then determine the value of (x – 5) + {1/(x – 5)}.
If x2 – xy + y2 = 16 and x4 + x2y2 + y4 = 320 then find x2 + xy + y2...
if a2 + b2 + c2 = 2(4a -5b -9c)-122 , then a-b-c = ?
If x2 – 5x + 1 = 0, then find the value of {x2 + (1/x2)}.