Question

$- \sqrt{0.2} ( \sqrt{98} \times \sqrt{10} + \sqrt{1.8} )$

Answer 1

$-\sqrt{0,2}(\sqrt{98}*\sqrt{10}+\sqrt{1,8})=-\sqrt{0,2}(\sqrt{49*2*2*5}+\sqrt{0,36*5})=-\sqrt{0,2}(7*2\sqrt{5}+0,6\sqrt{5})=-\sqrt{0,2}*14,6\sqrt{5}==-14.6*\sqrt{0,2*5}= -14,6}$