मराठी

sqrt(45) – 4sqrt(5) + sqrt(20) when simplified is ______. - Mathematics

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प्रश्न

`sqrt(45) - 4sqrt(5) + sqrt(20)` when simplified is ______.

पर्याय

  • `-3sqrt(5)`

  • `5sqrt(5)`

  • `-sqrt(5)`

  • `sqrt(5)`

MCQ
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उत्तर

`sqrt(45) - 4sqrt(5) + sqrt(20)` when simplified is `underlinebb(sqrt(5))`.

Explanation:

Let’s simplify each term:

`sqrt(45)`

= `sqrt(9 xx 5)`

= `3sqrt(5)`

Remains as is `-4sqrt(5)`

`sqrt(20)`

= `sqrt(4 xx 5)`

= `2sqrt(5)`

Now combine:

`sqrt(45) - 4sqrt(5) + sqrt(20)`

= `3sqrt(5) - 4sqrt(5) + 2sqrt(5)`

= `(3 - 4 + 2)sqrt(5)`

= `1sqrt(5)`

= `sqrt(5)`

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पाठ 1: Rational and Irrational Numbers - MULTIPLE CHOICE QUESTIONS [पृष्ठ १६]

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बी निर्मला शास्त्री Mathematics [English] Class 9 ICSE
पाठ 1 Rational and Irrational Numbers
MULTIPLE CHOICE QUESTIONS | Q 10. | पृष्ठ १६
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