Rasionalkanlah 4 akar 5 dibagi akar 5 kurang akar 3

[tex] \frac{4 \sqrt{5} }{5 - \sqrt{3} } \\ = \frac{4 \sqrt{5} }{5 - \sqrt{3} } \times \frac{5 + \sqrt{3} }{5 + \sqrt{3} } \\ = \frac{20 \sqrt{5} + 4 \sqrt{15} }{25 - 3} \\ = \frac{20 \sqrt{5}4 \sqrt{15} }{23} [/tex]

[tex]4 \sqrt{5 } \div \sqrt{5} - \sqrt{3} = 4 \times 1 - \sqrt{3} = 4 - \sqrt{3} [/tex]
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