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didapat m + n = 4
mn = 7
(m + n)² = 4²
m² + n² + 2mn = 16
m² + n² = 16 - 2mn
m² + n² = 16 - 2(7)
m² + n² = 16 - 14
m² + n² = 2
kalo puas jangan lupa kasih mahkota..!!