Hey there! Let us break this down step by step.
According to your information, we have x = 9, and only adding four.
All you have to do, is input your information, getting rid of the X!
Being: 9^2 + 4.
Now, the two right there is called an exponent, all you have to do is multiply the number you have in front of it- in this case it's 9 - by itself.
In this case, it'll be 9 times 9 (9x9), which is 81. After that, you are to add the 4, making your answer.....
85
Hope this helped!