Write the rationalising factor 5 + √2
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= 1 × 5-2½
5+2½ × 5-2½
= 5-2½
(5)²-(2½)²
formula used= (a)²-(b)² = (a+b) (a-b)
= 5-2½
25-2
= 5-2½
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Answer :
The rationalisation factor of √5-2 is √5+2 .
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