Question

Simplify (
$(\sqrt{7} + 2 ) ( \sqrt{7} - 2)$
​

Answer 1

$\underline{\underline{\textsf{\maltese\:\: Question :}}}$

Simplify (√7 + 2) (√7 - 2)

$\underline{\underline{\textsf{\maltese\:\: Concept Implemented :}}}$

● (a + b)² = a² + b² + 2ab

● (a - b)² = a² + b² - 2ab

● (a + b) (a - b) = a² - b²

$\underline{\underline{\textsf{\maltese\:\: Solution :}}}$

(√7 + 2) (√7 - 2)

= (√7)² - 2²

= 7 - 4

= 3