SOLUTION: Find the equation for f^-1(x). A/ f(x)=x-7 B/ f(x)= x^2+1

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Question 1090723: Find the equation for f^-1(x).
A/ f(x)=x-7
B/ f(x)= x^2+1
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
y=x-7
Interchange x and y and solve for y.
x=y-7
y=x%2B7
f%5E%28-1%29=x%2B7
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y=x%5E2%2B1
Interchange x and y and solve for y.
x=y%5E2%2B1
y%5E2=x-1
y=+0+%2B-+sqrt%28x-1%29
f%5E%28-1%29=0+%2B-+sqrt%28x-1%29
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