Question
Question: If mid point of (1, a) & (a + b, 2) is (–1, –1) then value of a<sup>2</sup> + b<sup>2</sup> is:...
If mid point of (1, a) & (a + b, 2) is (–1, –1) then value of
a2 + b2 is:
A
25
B
21
C
20
D
17
Answer
17
Explanation
Solution
Mid point is (21+a+b,2a+2)
But given (–1, –1) Ž a = – 4, b = 1