Question

$\sqrt{3} \times \sqrt{3} - \sqrt{5} ( - \sqrt{5}) + \sqrt{ {4}^{2} + 1} \times ( - \sqrt{17} )$

Answer 1

$\sqrt{3} \times \sqrt{3} - \sqrt{5} ( - \sqrt{5} ) \: + \sqrt{ {4}^{2} } = 12$
$( - ) \times ( - ) = ( + )$
$\sqrt{3} \times \sqrt{3} = 3$
$\sqrt{5} \times \sqrt{5} = 5$
$\sqrt{ {4}^{2} } = 4$
$3 + 5 + 4 = 12$