SOLUTION: i am in desperate need of some help...i do not understand how to do this it confuses me... it says "using f(x)=2x+1 find.. f(-1)= f(3.2) im not looking for the answers im looki

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Question 17638: i am in desperate need of some help...i do not understand how to do this it confuses me...
it says "using f(x)=2x+1 find..
f(-1)=
f(3.2)
im not looking for the answers im lookin to learn how to solve these so that i can do it on my own...any help would be greatly appericiated..
thanks
Answer by venugopalramana(3286) (Show Source):
You can put this solution on YOUR website!
im not looking for the answers im lookin to learn how to solve these so that i can do it on my own...
GREAT THAT IS THE SPIRIT..YOU WILL DEFINITELY SUCCEED..LET ME EXPLAIN
using f(x)=2x+1 find..
f(-1)=
f(3.2)=
f(x) means a function of x.that is you can give any permissible values to x (permissible so that the given function has some meaning..you will know later about domain as it is called)and substitute that value of x in r.h.s. of the equation given for f(x) to get the value of the function at that value of x ..so f(a) means ,put a in place of x wherever it occurs on the rhs and simplify
here f(x)=2x+1..we have to find f(-1)..that is put x=-1 on the r.h.s...so we get f(-1)=2(-1)+1=-2+1=-1..now you can be true to your word and continue with other example!!!!