Question

$\sqrt{128} - \sqrt{98} + \sqrt{18}$
what is the answer
options
$\sqrt{32}$
$\sqrt{48}$
$\sqrt{8}$
$\sqrt{2}$

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Answer 1

$\sqrt{128} = 8\sqrt{2} \\\\\sqrt[]{98} = 7\sqrt{2} \\\\\sqrt{18} = 3\sqrt{2} \\\\Substituting all values.\\\\8\sqrt{2} - 7\sqrt{2} + 3\sqrt{2} = 4\sqrt{2} \\\\4\sqrt{2} = \sqrt{32}$