Tolong pakai cara... Trmksh... (5+√2) (5-√2) = (7-2√3) (7+2√3) =

kalo gak salah sih gitu

PEMBAHASAN

[tex](5 + \sqrt{2} )(5 - \sqrt{2) } \\ {(5)}^{2} - 5 \sqrt{2} + 5 \sqrt{2} - {( \sqrt{2) \: } }^{2} \\ 25 - 2 \\ 23[/tex]

[tex](7 - 2 \sqrt{3} )(7 + 2 \sqrt{3} ) \\ {(7)}^{2} + 14 \sqrt{3 \: } - 14 \sqrt{3} - {(2 \sqrt{3) } }^{2} \\ 49 - 12 \\ 37[/tex]