Question

1. यदि a + b = 13 तथा a- b = √2 तो 4ab (a^2 + b^2) का मान
होगा :


(संयुक्त प्रवेश परीक्षा 2002, 09)​

Answer 1

Answer: 334

Step-by-step explanation: In these type of question if we remember some formula then it save our time in examination

a+b =13....................................(1)

a-b = √2...................................(2)

as we know (a+b)^2 - (a-b)^2 = 4ab

so simply taking sq. of both eq. and subtract 2 eq from 1 eq

169-2 = 167

on finding the value of (a^2 + b^2) =(a+b)^2 - 2ab

169-2*167/2=2 (we know the value of 4ab by dividing by 2 we get 2ab)

2*167 = 334