The function is defined for . What is ?
Answer and explanation
Correct answer: B.
- Step 1: Let , so .
- Step 2: , so .
- Step 3: Swap variables: .
Answer
.
Why not the others: : is the reciprocal of , not its inverse. : makes sign errors when collecting the terms. : makes a sign error on the denominator.
Practise more Algebra and functions.
Free questions with an explanation for every one, and full timed ESAT (Engineering and Science Admissions Test) mock tests.