Answer:
B
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 )
± [tex]\sqrt{y-7}[/tex] = x
Change y back into terms of x, thus
[tex]f^{-1}[/tex](x) = ± [tex]\sqrt{x-7}[/tex]
