Q399
If a2 + b2 = 4b + 6a - 13, then what is the value of a + b?
A.
3
B.
2
C.
5
AnswerD.
10
Answer: Option C
Solution
Answer: Option C
Solution:
a2 + b2 = 4b + 6a - 13a2 + 9 - 3a + b2 + 4 - 4b = 0
(a - 3)2 + (b - 2)2 = 0
a = 3, b = 2
a + b = 5