Answer:
Below!
Explanation:
1. Kelly is correct. The Reason Kelly's is correct is because she set the equation to 0 in the beginning. From step 2-3 Jill just eliminated the 9 which you can't do.
2. x = 4.
3. 4^2+2(4) - 15 = 9 This equation works when you solve it
4. x = -6
5. -6^2+2(-6) - 15 = 9 This equation works when you solve it