1.

Simplify​

Answer»

4 \sqrt{81} - 8 \sqrt[3]{343} + 15 \sqrt[5]{32} + \sqrt{225} \\ \\ = 4 \sqrt{( {9)}^{2} } - 8 \sqrt[3]{ {(7)}^{3} } + 15 \sqrt[5]{ {(2)}^{5} } + \sqrt{( {15)}^{2} } \\ \\ = (4 \times 9) - (8 \times 7) + (15 \times 2) + 15 \\ \\ = 36 - 56 + 30 + 15 \\ \\ = - 20 + 45 \\ \\ = 25


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