Question

(√40)² -(√10)² is .... option A:- 30 B:- ,1600, C:-50 D:- ,1200

Answer 1

^2 means power 2 like. 3^2 =9 and 5^2 = 25

Okay now

( √40 ) ^2 = 40 bc the power cancels the square root like for e.g.

( √5 )^2 =5. This is bc √ = ^1/2 and ^1/2 x ^2 = 1. 40^1 = 40

So ( √10 ) ^2 = 10

40- 10 =30