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1. -x² - 6x + 40 = 0 ....... kalikan dgn minus
x² + 6x - 40 = 0
x² + 6x = 40 ..... masing2 ruas tambahkan bilangan yg sama 6/2 = 3 .... 3² = 9
x² + 6x + 9 = 40 + 9
(x + 3)² = 49
x + 3 = +-√49
x + 3 = +- 7
x₁ = 7 - 3 = 4
x₂ = -7 - 3 = -10
yg lain bisa gunakan pemfaktoran (kalo sudah bisa)
atau rumus persaman kuadrat