Step-by-step explanation:
Completing the square:
x^2 + 10x - 13 = x^2 + 10x + 25 - 25 - 13 = (x + 5)^2 - 38
Part A:
25 - 25
Part B:
(x + 5)^2 - 38
Answer:
1. 2 period
2.