Question

rationalise 2-root5/2+root 5

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

-9+4√5

Step-by-step explanation:

(2-√5)/(2+√5)×(2-√5) /(2-√5)

{(2-√5)^2 } / (2)^2-(√5)^2

by applying identities....

{(2)^2-(2×2×√5)+(√5)^2} / 4-5

(4-4√5+5) / -1

(4+5-4√5) / -1

(9-4√5)/-1

-(9-4√5)

-9+4√5

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