Given the function f(x) = 3x, find the value of f−1(27).
1 answer:
the value of f-1(27) is 9.
In order to find this answer, we first have to find the inverse function (since that is what f-1 means). To do this, we switch the f(x) value and the x. Then we solve for the new f(x). The result is the inverse function. The work for this is below.
f(x) = 3x ----> Switch the f(x) and the x.
x = 3f(x) ---> divide by 3.
f-1(x) = .
Now that we have this, we can plug in 27 (the number in parenthesis) and find the result.
f-1(x) =
f-1(27) =
f-1(27) = 9
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Step-by-step explanation:
By simple interest formula:
Writing some equations out might help!
1) You know that a is 4/5 of b. This can be written as:
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To find what b is equal to, multiply both sides by 5/4:
.
A is 5/4 B.
2) You know that a is 1/5 smaller than b. This can be written as:
.
To find b, just add 1/5 to both sides:
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B is 1/5 bigger than a.
1) You know that a is 4/5 of b. This can be written as:
To find what b is equal to, multiply both sides by 5/4:
A is 5/4 B.
2) You know that a is 1/5 smaller than b. This can be written as:
To find b, just add 1/5 to both sides:
B is 1/5 bigger than a.