Question

Simplify the following expression:(5+√7)(5-√7)​

Answer 1

Answer:

18

Step-by-step explanation:

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

(5+✓7)(5-✓7) = (5)^2 - (✓7)^2 = 25-7 = 18

Answer 2

$\huge{\underline{\underline{\mathfrak{\orange{AnSwEr}}}}}$

Given:-

$(5 + \sqrt{7})(5 - \sqrt{7})$

Solution:-

$(5 + \sqrt{7})(5 - \sqrt{7}) = > 5 {}^{2} - ( \sqrt{7})^{2}$

$= > 25 - 7 = 18 ans$

$\rule{190}2$

Identity used:-

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