Question

Given the function f(x)=-8x+1, find f^-1(-15).

Answer 1

Need Help??

Answer 2

yeah

Answer 3

Ok Give Me One Sec

Answer 4

I don't understand the question so one minute im gonna get someone to come and help

Answer 5

ok

Answer 6

@ChantySquirrel1129**

Answer 7

@Sword

Answer 8

@ikram002p

Answer 9

@HelloKitty17

Answer 10

@pooja195

Answer 11

One sec......

Answer 12

You need the inverse function or f(x)

Do you know how to do this?

Answer 13

@ybarrap would that be f^-1(Y) = (y - 1) / -8 ?

Answer 14

y=-8x+1
exchange x and y
x=-8y+1
solve for y
8y=1-x
y=(1-x)/8

This is the inverse of f(x)
$$
f^{-1}(x)=\cfrac{1-x}{8}
$$
Now just plug-in x=-15;
$$
f^{-1}(-15)=\cfrac{1-(-15)}{8}
$$
Make sense?