Bantu Dong :) Ntar Ane Jadiin Jawaban Terbaik Dehh :)

[tex] \frac{1}{m} + \frac{1}{n} = \frac{4}{7} [/tex]
[tex] \frac{m + n}{mn} = \frac{4}{7} [/tex]

m+n = 4
mn = 7

m² + n² = (m + n)² - 2mn
             = 4² - 2(7)
             = 16 - 14
             = 2