Question

$3\sqrt[3]{2x^{2}}-7^{3} \sqrt[3]{16x^{2}}+5 \sqrt[3]{54x^{2}}$

Answer 1

$3 \sqrt[3]{2 x^{2} } - 7^{3} \sqrt[3]{2^{3}*2x^{2} } +5 \sqrt[3]{3^{3}*2x^{2} } = 3 \sqrt[3]{2x^{2} } - 7^{3} (2) \sqrt[3]{2x^{2}} +5(3) \sqrt[3]{2x^{2}} = 3 \sqrt[3]{2x^{2} } - 686 \sqrt[3]{2x^{2} } + 15 \sqrt[3]{2x^{2} } = R./ -568 \sqrt[3]{2x^{2} }$