Square root of (7 - 4√3) is equal to :

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HTET TGT Mathematics 2017 Official Paper
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  1. ± (2 + √3)
  2. ± (2 - √3)
  3. ± (√2 - 3)
  4. ± (√2 + 3)

Answer (Detailed Solution Below)

Option 2 : ± (2 - √3)
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HTET PGT Official Computer Science Paper - 2019
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60 Questions 60 Marks 60 Mins

Detailed Solution

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Formula Used:

(a - b)2 = a2 - 2ab + b2

Calculation:   

\(\Rightarrow\pm\sqrt{7-4\sqrt3}\;\)   

\(⇒ ± \sqrt{4 + 3 - 4\sqrt{3}}\)

\(⇒ ± \sqrt{(2)^2 + (-\sqrt{3})^2 - 2\times2\times\sqrt{3}}\)

\(\therefore ± (2 - \sqrt{3})\)

The correct option is 2 i.e. ± (2 - √3)

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