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1. Find f^1 (x) for f(x) = -2 / 5x+3

I got f^-1 (x) = -2 - 3x / 5x

Is that right?

2 answers

f = -2/(5x+3)
5x+3 = -2/f
x = (-3 - 2/f)/5 = (-3f-2)/5f

You are correct if you toss in some clarifying parentheses.

As written, -2 - 3x/5x = -2 - 3/5 - -13/5

In the absence of text formatting or parentheses, PEMDAS rules.
ok, i'll remember that next time
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