(8 + 2√15)चे वर्गमूळ काय ?

  1. √5 + √3
  2. 2√2 + 2√6
  3. 2√5 + 2√3
  4. √2 + √6

Answer (Detailed Solution Below)

Option 1 : √5 + √3
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SSC CHSL General Intelligence Sectional Test 1
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Detailed Solution

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वापरलेले सुत्र:

(a + b)2 = a2 + b2 + 2ab

गणना:

दिलेली पदावली आहे:

\(\sqrt {8\; + \;2\sqrt {15} \;} \)

⇒ \(\sqrt {5\; + \;3\; + \;2\times \sqrt 5 \times \sqrt 3 \;} \)

⇒  \(\sqrt {{{(\sqrt 5 )}^2}\; + \;{{\left( {\sqrt 3 } \right)}^2}\; + \;2 \times \sqrt 5 \times \sqrt 3 \;} \)

⇒  \(\sqrt {{{\left( {\;\sqrt 5 \; + \;\sqrt 3 \;} \right)}^2}\;} \)

⇒  \(\sqrt 5 + \sqrt 3 \)

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