Question

simplify : 4√20+1/2√245 -√405

Answer 1

here is your answer

$4 \sqrt{20} + \frac{1}{2} \sqrt{245} - \sqrt{405}$
$4 \sqrt{2 \times 2 \times 5} + \frac{1}{2} \sqrt{5 \times 7 \times 7 } - \\ \sqrt{5 \times 3 \times 3 \times 3 \times 3 } \\ 8 \sqrt{5} + \frac{7}{2} \sqrt{5 } - 9 \sqrt{5} \\ \\ \sqrt{5} (8 + \frac{7}{2} - 9) \\ \\ \sqrt{5} ( \frac{8 \times 2 + 7 \times 1 - 9 \times 2}{2} ) \\ \\ \sqrt{5} ( \frac{16 + 7 - 18}{2} ) \\ \\ \sqrt{5} \times \frac{5}{2} \\ \\ \frac{5 \sqrt{5} }{2}$
hope this helps you
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