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Verified answer
1/m + 1/n = 4/7n/mn + m/mn = 4/7
(m + n) / mn = 4/7
Didapat m + n = 4 , mn = 7
(m + n)² = m² + 2mn + n²
m² + n² = (m + n)² - 2mn
m² + n² = (4)² - 2(7)
m² + n² = 16 - 14
m² + n² = 2