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CISCE(English Medium) ICSE Class 9
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Syllabus

Find the Square of : √5 - 2 - Mathematics

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Question

Find the square of : √5 - 2

Sum
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Solution

( √5 - 2 )2 = ( √5 )2 - 2( √5 )( 2 ) + ( 2 )2
= 5 - 4√5 + 4
= 9 - 4√5

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Q 2.3
Chapter 1: Rational and Irrational Numbers - Exercise 1 (B) [Page 13]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 1 Rational and Irrational Numbers
Exercise 1 (B) | Q 2.3 | Page 13
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