Functions?

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Use the function f(x) = 3x-2 to

1. Determine f^-1
2.If f(a) = 4, determine the numerical value of f^-1 x (4)

2007-12-12 05:56:58 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

For the 2nd part of the question:

f^-1 x (4)

f to the power of -1 times 4

2007-12-12 06:24:40 · update #1

2 answers

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

If f(a) = 4, then a = 2

Don't understand the rest of your question. Is the x a multiplication sign or should it be surrounded by parentheses?

2007-12-12 06:08:50 · answer #1 · answered by ironduke8159 7 · 0⤊ 0⤋

y = 3x-2
(y+2)/3 = x
Interchange x and y:
(x+2)/3 = y is the inverse.

f^-1(4) = (4+2)/3 = 2. Not sure where the f(a)=4 is needed.

2007-12-12 06:06:52 · answer #2 · answered by fcas80 7 · 0⤊ 0⤋