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Expand: (2 + sqrt(5))^2 - Mathematics

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प्रश्न

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`(2 + sqrt(5))^2`

बेरीज
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उत्तर

We have, `(2 + sqrt(5))^2`

= `2^2 + (sqrt(5))^2 + 2 xx 2 xx sqrt(5)`  ...[Use (a + b)2 = a2 + b2 + 2ab]

= `4 + 5 + 4sqrt(5)`

= `9 + 4sqrt(5)`

Therefore, the required is `9 + 4sqrt(5)`.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Rational and Irrational Numbers - EXERCISE 1C [पृष्ठ १५]

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बी निर्मला शास्त्री Mathematics [English] Class 9 ICSE
पाठ 1 Rational and Irrational Numbers
EXERCISE 1C | Q 5. (i) | पृष्ठ १५
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