Question

If f(x) and rl (x) are inverse functions of each other and f(x) = 2х+5, what is rl (8) ?
теnju
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loo 3

Answer 1

Answer:

r(8)=1.5

Step-by-step explanation:

The given function is $f(x)=2x+5$

when f(x)=8, we have $8=2x+5$

This implies that:

$8-5=2x$

$3=2x$

$x=1.5$

Hence the point (1.5,8) lies on f(x)

The inverse of function r(x) will have the corresponding point (8,1.5)

This means that:

$r(8)=1.5$