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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 (1+a+b2,a+22)\left( \frac{1 + a + b}{2},\frac{a + 2}{2} \right)

But given (–1, –1) Ž a = – 4, b = 1