3 years ago

Let f(x) = 2x − 6. solve f−1(x) when x = 2.

1 answer:

3 0

F(x) = 2x - 6

y = 2x - 6
2x - 6 = y |add 6 to both sides
2x = y + 6 |divide both sides by 2
x = 1/2y + 3

f^{-1}(x) = 1/2x + 3

f^{-1}(2) = 1/2 · 2 + 3 = 1 + 3 = 4

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