Uhhleeah
Uhhleeah
21-01-2015
Mathematics
Answered
Let f(x) = 2x - 6. Solve f-1(x) when x = 2.
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superkoopasirf
superkoopasirf
21-01-2015
[tex]f(x) = 2x - 6 \\\\ ff^{-1}(x) = 2f^{-1}(x) - 6 \\\\ x = 2f^{-1}(x) - 6 \\\\ \implies f^{-1}(x) = \frac{x + 6}{2} \\\\\\ f^{-1}(2) = \frac{2 + 6}{2 } = \frac{8}{2} = \boxed{4}[/tex]
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