If x + (1/x) = 5, what is the value of R=x^2 + (1/x)^2? Choose the correct answer.
A) r = 21  B) r = 22  C) r = 23  D) 24  E) 27

Rationale: "squaring on both sides , x ^ 2 + ( 1 / x ) ^ 2 + 2 ( x ) ( 1 / x ) = 5 ^ 2 x ^ 2 + ( 1 / x ) ^ 2 = 23 answer : c"
Answer: C