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Verified answer
Kelas 10 MatematikaBab Persamaan Kuadrat
α - 5 = x
α = x + 5
x² + 6x - 7 = 0
(x + 5)² + 6 (x + 5) - 7 = 0
x² + 10x + 25 + 6x + 30 - 7 = 0
x² + 16x + 48 = 0