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Mathematics, 13.12.2020 18:40 hartmaaj95

NEED HELP ASAP if \frac{9}{4+6\sqrt{2} } is my equation and \frac{18-27\sqrt{2} }{28} is my answer. Why do i get \frac{-9(2-3\sqrt{2} )}{28} as my answer? can you solve it and explain why im wrong?

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