Answer:
c = 22
Step-by-step explanation:
Remark
You have to make c large enough so that when subtracted from 103, you get 81
Solution
x^2 + c = 103
x = 9
9^2 + c = 103
81 + c = 103
Subtract 81 from both sides
81 - 81 + c = 103 - 81
c = 22
- 9 does exactly the same thing.
Check
x^2 + 22 = 103
x^2 - 22 = 103 - 22
x^2 = 81
sqrt(x^2) = sqrt(81)
x = +/- 9
