What is the square root of (7+3\sqrt5 ) (7-3\sqrt5 )?

Powers and Roots Practice Test 1

Question : 2 of 40

Marks: +1, -0

What is the square root of

(7+3√5 ) (7-3√5 )?

Solution:

√{(7+3√5 ) (7-3√5 ) }

=√{(7)^2-(3√5 )^2}

=√{49-45}=2

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