Question

please give me the answer​

Answer 1

Answer:

$\frac{4}{7 + 4 \sqrt{3} } \\ \\ = \frac{4}{7 + 4 \sqrt{3} } \times \frac{7 - 4 \sqrt{3} }{7 - 4 \sqrt{3} } \\ \\ = \frac{4 \times (7 - 4 \sqrt{3}) }{ {(7)}^{2} - {(4 \sqrt{3)} }^{2} } \\ \\ \frac{28 - 16 \sqrt{3} }{49 - 48} \\ \\ \frac{28 - 16 \sqrt{3} }{1} \\ \\ = 28 - 16 \sqrt{3}$

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