116. I f a ⇀ = 2 , b ⇀ = 3 a n d a ⇀ + b ⇀ = 6 , t h e n w h a t i s a ⇀ - b ⇀ e q u a l t o ? 1. 1 2. 2 3. 3 4. 4 Share with your friends Share 0 Prateek_2 answered this 0 View Full Answer Jegannathan Anandaraman answered this Hi Kapoor, option (b) i.e. 2 is the correct answer How? |a+b|^2 + |a - b|^2 = 2 [|a|^2 + |b|^2] So 6 + x^2 = 2 [2 + 3] = 10 OR x^2 = 4 So x = 2 1
