1+√2/1-√2+1-√2/1+√2=a+b√2 find a and b
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Ques : √2 - 1 / √2 + 1 = a + b√2
Firstly , rationalize the denominator of the LHS....
√2 - 1 / √2 + 1
= (√2 - 1 / √2 + 1) × ( √2 - 1 / √2 - 1)
= ( √2 - 1 )^2 / (√2)^2 - (1)^2
= [ (√2)^2 + (1)^2 - 2*√2*1 ] / 2 - 1
= (2 + 1 - 2√2) / 1
= 3 - 2√2
We know that ,,
=> 3 - 2√2 = a + b√2
So,
a = 3
b = - 2
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