Question

What is the value of the expression f2 + 8 if f = 7?

Answer 1

Hey, TailsIsTheBest!
Great question=)

Question:What is the value of the expression f2 + 8 if f = 7?

Answer:22

Work:They already gave us the value of the variable f, so all we have to do it plug in 7 for f's place. 

(7)2+8
7*2=14
14+8=22

I hope this helps;)
If you have any questions on my work, feel free to ask me.

Answer 2

If the values are placed right next to each other without a symbol, then you multiply them. 
So, you multiply the value of 7 with 2, since they are placed right next to each other. 
(7x2) + 8 = 14 + 8 = 22