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Persimmon
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Homework Statement
Given the function f(x) = (abs(x))*x +6, find f^-1(x)
Homework Equations
The Attempt at a Solution
for x≥ 0, f(x) = x^2 + 6
y=x^2 +6
x = √(y-6) for y≥6
→ f^-1(x) = √(x-6) for x≥6
for x< 0, f(x) = -x^2 + 6
y= -x^2 +6
x = √(6-y) for y<6
→ f^-1(x) = √(6-x) for x<6
But the correct answer is
f^-1(x) = ±√(x-6) with the domain and range as all real numbers.
How do I get the inverse function to not be piecewise?
Sorry about the lack of proper equations, I don't know how to use latex.