Q. 9 The square root of (7 + 3V5)(7- 3V5) is – InterviewSolution

1.

Q. 9 The square root of (7 + 3V5)(7- 3V5) is

Answer»

sqrt[(7 + 3(5)^1/2 * (7 - 3(5)^1/2)]

Using (a + b)(a - b) = a^2 + b^2

= sqrt(7^2 - 3^2×5)

= sqrt(49 - 45)

= sqrt(4)

= 2

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