Question

सरल कीजिए (5+√7)×(5-√7)​

Answer 1

$\huge\fcolorbox{red}{cyan}{18}$

Step-by-step explanation:

$(5+\sqrt{7})(5-\sqrt{7}) \\ => \bf\color{purple}{(a+b)(a-b)=a²-b²} \\ => (5)² - (\sqrt{7})² \\ => 25 - 7 \\ => \boxed{18}$

Hope it helped

Answer 2

Answer :

उत्तर है : 18

Step-by-step explanation:

फार्मूला  : (a+b)(a-b)= $a^{2}$- $b^{2}$

 = (5 + $\sqrt{7}$) (5 - $\sqrt{7}$)

 = $(5)^{2} - ({\sqrt{7})^2} }$

 = 25 - 7

 = 18