¿Cual es el procedimiento de esta ecuacion con valor absoluto?

I x² + 3x - 15 I = 3

x² + 3x - 15 = 3 ó x² + 3x - 15 = - 3

x² + 3x - 15 - 3 = 0 ó x² + 3x - 15 + 3 = 0

x² + 3x - 18 = 0 ó x² + 3x - 12 = 0

(x + 6)(x - 3) = 0 ó a = 1 b = 3 c = - 12

x₁ + 6 = 0 ; x₂ - 3 = 0 ó x = ( - b±√b² - 4ac) / 2a

x₁ = - 6 ; x₂ = 3 ó x = [ - (3)±√(3)² - 4(1)( - 12)) / 2(1)] x₃ = ( - 3 + √57) / 2 ; x₄ = ( - 3 - √57) / 2

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