Correct option (a) 2x - 5
Explanation :
Here, |x| is not one-one and
is not one-to-one. Also, x2 +1 is not one-to-one. However, 2x - 5 is one-to-one because
f (x) = ⇒ f (y) ⇒ 2x - 5 = 2y - 5 ⇒ x = y
Now, f (x) = − 2x- 5 is onto and therefore, f (x) = 2x - 5 is bijective.