Question

Simplify (√13+√5) (√13-√5)

Answer 1

Answer: 8

Step-by-step explanation: by using formula,(a+b)(a-b)=a²-b²

         (√13 +√5)(√13-√5)= (√13)²-(√5)²=13-5=8

Answer 2

$( \sqrt{13} + \sqrt{5} )( \sqrt{13} - \sqrt{5} ) \\ \\ = ( { \sqrt{13} })^{2} - ({ \sqrt{5} })^{2}..by \: using \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed{ (a + b) (a - b) = a^{2} - {b}^{2} } \\ \\ = (13 - 5) \\ \\ = \green{ \boxed{8}}$