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(x + 10) (x - 3) = 0
x₁ = -10 atau x₂ = 3
b. 2x² + 7x + 5 = 0
2x² + 2x + 5x + 5 =0
2x (x + 1) + 5 (x + 1) = 0
(2x + 5) (x + 1) = 0
x₁ = -5/2 atau x₂ = -1