Write the rationalising factor of √5+2
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Rationalising factor of an irrational number is the one which when multiplied with the irrational number gives a rational number as the product
The rational number of √5-2 is √5+2
(√5-2) (√5+2)
(a+b)(a-b)=a²-b²
=√5²-2²
=5-4
=1
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