Question

3.The number obtained on rationalising the denominator of 1/root 5-2
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Answer 1

Answer:

root5+2/(root5)^2-(2)^2

Step-by-step explanation:

rationalising factor is 1/root5+2

=1/root5-2 × root5+2/root5+2

=root5+2/(root5-2)(root5+2)...

here in denominator we use (a+b)(a-b)=a^2-b^2

we get

=root5+2/(root5)^2-(2)^2