simplify by rationalizing the denomiatotor : 1 by 2√7-√5
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= 1 / ( 2 √7 - √5 )
Multiplying numerator and denominator by ( 2 √7 + √5 )
= 1 ( 2 √7 + √5 ) / ( 2 √7 - √5 ) ( 2√7 + √5 )
= ( 2 √7 + √5 ) / [ ( 2√7 ) ^ 2 - ( √5 ) ^ 2 ]
= ( 2 √7 + √5 ) / ( 4 * 7 - 5 )
= ( 2√7 + √5 ) / ( 28 - 5 )
= ( 2√7 + √5 ) / 23.
Multiplying numerator and denominator by ( 2 √7 + √5 )
= 1 ( 2 √7 + √5 ) / ( 2 √7 - √5 ) ( 2√7 + √5 )
= ( 2 √7 + √5 ) / [ ( 2√7 ) ^ 2 - ( √5 ) ^ 2 ]
= ( 2 √7 + √5 ) / ( 4 * 7 - 5 )
= ( 2√7 + √5 ) / ( 28 - 5 )
= ( 2√7 + √5 ) / 23.
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