4 years ago

Please help with the question.

Mathematics

1 answer:

Tju [1.3M]4 years ago

7 0

Answer:

Step-by-step 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 )

± $\sqrt{y-7}$ = x

Change y back into terms of x, thus

$f^{-1}$ (x) = ± $\sqrt{x-7}$

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