Question

If f(x) = x² + 7, what is the equation for f¹(x)?

Answer 1

`\begin{gathered} f(x)=x^2+7 \\ y=x^2+7 \\ x=y^2+7 \\ y^2=x\text{ - }7 \\ y=\pm\sqrt{x\text{ -7}} \\ f^{\text{ -1}}(x)=\pm\sqrt{x\text{ -7}}\text{ } \\ \end{gathered}`

Option A is correc.