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If (x)=2x+10,then f^-1(x)
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If (x)=2x+10,then f^-1(x)

User DrewT
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If f(x) = 2x + 10, then x = 2(f^-1(x)) + 10
[swap f(x) for x and x for f^-1(x)]

Rearrange:
2(f^-1(x)) = x - 10
f^-1(x) = (x - 10)/2
User Raganwald
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