Question

qual o resultado....-2√10-5√90+6√10-8√40

Answer 1

$\sqrt{90} = \sqrt{9}*\sqrt{10} = 3\sqrt{10}*5 = -15\sqrt{10}\\\\ \sqrt{40} = \sqrt{4}*\sqrt{10} = 2\sqrt{10}*8 = -16\sqrt{10}\\\\\ -2\sqrt{10} -15\sqrt{10} +6\sqrt{10} -16\sqrt{10} = \\\\\ \boxed{-27\sqrt{10} }$