Question

solve this one pls ​

Answer 1

So, here it is..

[(√5-2)/(√5+2)]-[(√5+2)/(√5-2)]

=[(√5-2)/(√5+2)*(√5-2)/(√5-2)]-[(√5+2)/(√5-2)*(√5+2)/(√5+2)]

multiplied (√5+2) & (√5-2) both sides

=[(√5-2)²/5-4]-[(√5+2)²/5-4]

=[5-4√5+4]-[5+4√5+4]

=5-4√5+4-5-4√5-4

=-8√5

Hope it helped. ^_^

plz mark on brain list

Answer 2

$(\sqrt{5} )^{2} - 2^{2} \\ identity \: ( {a}^{2} - {b}^{2} ) = (a + b)(a - b) \\ \\ ( \sqrt{5 } - 2) ^{2} \\ identity \: (a - b)^{2} = {a}^{2} + {b}^{2} - 2ab \\ now \frac{5 + 4 - 2 \sqrt{5} \times 2}{5 - 4} \\ = \frac{9 - 4 \sqrt{5} }{1} \\ = 9 - 4 \sqrt{5}$

ur rationalise is wrong......u have to take both sign negative....bcz denominator is positive

mark brainliest plzzzz....