Question

ratinalise the denominator of 2+√3upon 2-√3

Answer 1

$\frac{2 + \sqrt{3} }{2 - \sqrt{3} } \times \frac{2 + \sqrt{3} }{2 + \sqrt{3} }$
(a+b)²= a²+b²+2ab. a²-b²=(a+b)(a-b)

$\frac{ {(2 + \sqrt{3)} }^{2} }{ {2 }^{2} - 3 \ }$
(2+√3)²= 4+3+4√3
2²-3=1
(2+√3)²/2²-3= 7+4√3/1
7+4√3