ill give a medal (:
If f(x)=x+3 over 4, what is the equation for f^–1(x)?

Question

ill give a medal (:
 If f(x)=x+3 over 4, what is the equation for f^–1(x)?

anonymous · Answer

think of it as resolving the equation again i.e we have $$y = \frac{x + 3}{4}$$ if we switch the y and the x we can solve for y again so now we have $$x = \frac{y + 3}{4}$$ now all you have to do is solve for y again and you will have your answer :)

emilyjones284 · Answer

I dont understand the solving part haha

anonymous · Answer

ah i see we have$$x = \frac{y+3}{4}$$
since we cant do anything until the fraction part is over we have to muliply by 4 on both side which will give us $$4x =y +3$$ now we only have one more step until we can finsh which is adding 3 from both sides now we have $$4x + 3 = y$$or in our case$$f^{-1}(x)=4x +3$$

emilyjones284 · Answer

Ok thanks a lot I got it now (:

anonymous · Answer

no problem :P