im reallly not getting this Let f(x) = x2 - 81. Find f-1(x).

label Algebra
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Let f(x) = x2 - 81. Find f-1(x).

Nov 26th, 2014

To find the inverse function, you switch x and y and solve for y.

y = x^2 - 81

Switch x and y:

x = y^2 - 81

Now solve for y:

x + 81 = y^2

y = sqrt(x+81)

Nov 26th, 2014

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Nov 26th, 2014
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Nov 26th, 2014
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