$$\sqrt [ 4 ] { 81 } - 8 \sqrt [ 3 ] { 216 } + 15 \sqrt [ 5 ] { 32 } + \sqrt { 225 }$$
$0$
$$3-8\sqrt[3]{216}+15\sqrt[5]{32}+\sqrt{225}$$
$$3-8\times 6+15\sqrt[5]{32}+\sqrt{225}$$
$$3-48+15\sqrt[5]{32}+\sqrt{225}$$
$$-45+15\sqrt[5]{32}+\sqrt{225}$$
$$-45+15\times 2+\sqrt{225}$$
$$-45+30+\sqrt{225}$$
$$-15+\sqrt{225}$$
$$-15+15$$
$$0$$
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