Question

Please help with the question.

Answer 1

B

Explanation:

Let y = f(x) and rearrange making x the subject

y = x² + 7 ( subtract 7 from both sides )

y - 7 = x² ( take the square root of both sides )

±
`√(y-7)` = x

Change y back into terms of x, thus

`f^(-1)`(x) = ±
`√(x-7)`