If F(x) = 8x + 20;
Find F-1(x).
Solution
HINT: F-1(x)
means inverse.
PROCEDURE:
Make x the subject and
then interchange x and y variables.
Let y=F(x)
So, y= 8x + 20
y – 20 = 8x
y – 20 = 8x
8
8
y – 20 = x
8
x = y
– 20 after rearranging
8
y-1 = x – 20 after interchanging x and y variables.
8
F-1(x) = x
– 20 after interchanging x and y
variables.
8
Hence, F-1(x) = x – 20
8
TRY THIS……………………………
If F(x) = 2x - 26; Find F-1(x).
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