Question

hay guys please help me
$( \sqrt{5} + 2)( \sqrt{5} - 4)$

Answer 1

$( \sqrt{5} + 2)( \sqrt{5} - 4) \\ = \sqrt{5} . \sqrt{5} - \sqrt{5} .4 + 2. \sqrt{5} - 2.4 \: distribute. \\ = \sqrt{25} - 4 \sqrt{5} + 2 \sqrt{5} - 8 \: simplify. \\ = 5 - 4 \sqrt{5} + 2 \sqrt{5} - 8 \\ = 5 - 8 - 4 \sqrt{5} + 2 \sqrt{5} \: combine \: like \: terms. \\ = - 3 - 2 \sqrt{5}$

Answer 2

here is ur solution see image.....