Answer:
21.25
Step-by-step explanation:
Substitute n with 4.5 and m with -3.5
Now the equation looks like this:
4.5^2+4.5-3.5
4.5^2 is 20.25
20.25+4.5 is 24.75
24.65-3.5 is 21.25
Hope this helps!
