State with reasons which of the following are surds and which are not:
[tex]1. \sqrt[3]{4} \times 5 \sqrt[3]{16} [/tex]
[tex]2. \sqrt[4]{3} \times \sqrt[3]{9} [/tex]
[tex]3. \sqrt[5]{16} \div \sqrt[3]{32} [/tex]
[tex]4.( \sqrt{2} + \sqrt{3} ) \times ( \sqrt{2} - \sqrt{3} )[/tex]
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Answer:
(1)
(2)
(3)
(4)