Home » Evaluate (x + (frac{1}{x}) + 1)2 – (x + (frac{1}{x}) + 1)2

Evaluate (x + (frac{1}{x}) + 1)2 – (x + (frac{1}{x}) + 1)2

Evaluate (x + (frac{1}{x}) + 1)2 – (x + (frac{1}{x}) + 1)2
  • A.
    4x2
  • B.
    ((frac{2}{x}) + 2)2
  • C.
    4
  • D.
    4(1 + x)
Correct Answer: Option D
Explanation

(x + (frac{1}{x}) + 1)2 – (x + (frac{1}{x}) + 1)2
= (x + (frac{1}{x}) + 1 + x + (frac{-1}{x}) – 1)(x – (frac{1}{x}) + 1 – x + (frac{1}{x}) + 1)
= (2x) (2 + (frac{2}{x})) = 2x x 2(1 + (frac{1}{x}))
4x (1 + (frac{1}{x})) = 4x + 4
= 4(1 + x)