# How do you evaluate the function #g(x)=2x+7# when x=3?

##### 1 Answer

Dec 23, 2016

#### Explanation:

Whenever you're given a function, you simply plug in the

#g(x)=2x+7# #g(3)=2(3)+7# -
#g(3)=13# -
The idea of a function is that you are given a value and you just have to plug that in your function, like I mentioned above.

- The other thing that you may come across is the problem will ask you to graph a certain function. For those, you can simply plug in random values into the function and come up with points. For example, with the function in the above question
#g(x)=2x=7# , plugging in#3# , gave us the result#13# . What that means is#(3, 13)# is a point on your graph. so you plug in different#x# values and you get different results and those are all points on your graph.

Hope it helped (c: