The square root of (7 + 3\sqrt 5 ) (7 - 3 \sqrt5 ) is

SSC CHSL Model Paper 2

Question : 63 of 100

Marks: +1, -0

The square root of

(7 + 3√ 5 ) (7 - 3 √5 )

Solution:

(7 + 3√ 5 ) (7 - 3 √5 )

= (7)^2 - (3 √5 )^2

= 49 – 45 = 4
Square root =

√4 = 2

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