Rationalise1/ 2+under root 5 on copy
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2
[1/(2+√5)]×[(2-√5)/(2-√5)
[1(2-√5)]/(2+√5)(2-√5)
(2-√5)/[(2×2)-(√5×√5)]
(2-√5)/(4-5)
(2-√5)/(-1)
√5-2
[1(2-√5)]/(2+√5)(2-√5)
(2-√5)/[(2×2)-(√5×√5)]
(2-√5)/(4-5)
(2-√5)/(-1)
√5-2
Answered by
1
=> 1/2 + root 5 => 1 (2 - root 5)/(2+ root 5)(2- root 5) => 2- root 5 / (2)^2 - (root 5)^2 => 2- root 5 / 4 - 5 => 2- root 5 / -1 => -(2- root 5) => -2 + root 5 => root 5 -2 Hope it may help you
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