Question

-5f-2+8-3k use f=7 and k=8

Answer 1

-5f-2+8-3k
Substitute variables for numbers
-5(7)-2+8-3(8)
Multiply -5 by 7 and -3 by 8
-35-2+8-24
Combine like terms
Final Answer: -53

Answer 2

You have to plug in 7 for f and 8 for k making it look like -5(7)-2+8-3(8), now multiply to get the further more, -35-2+8-24, now add or subtract to get -53

Hope this helps