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# What does it mean to rationalise the denominator?

2 years ago

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Bridie Price

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Devan-Kumar M
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To rationalise the denominator is to remove all square root signs from the bottom of the fraction. An example would be if you had the fraction 1/sqrt(5). To rationalise this fraction, you would multiply the numerator and denominator by sqrt(5) to get sqrt(5)/5. This is rationalised as the denominator does not contain a square root sign even though the numerator does.

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