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x² - 6x + 13
Formula.
x = [-b +/- √(b² - 4ac)]/2a
a = 1
b = - 6
c = 13
x = [ -(- 6)+/-√((-6)² - 4(1)(13)]/2(1)
x = [ 6 +/-√(36 - 52)]/2
x = [6 +/-√(- 16)]/2 Colocas √-16 = √(16 * - 1)
x = [6 + /- √(16)(-1)]/2 Aplicas √(a * b) = √a * √b
x = [ 6 +/- √16 * √-1)]/2 Pero √-1 = i
x = [ 6 + /- 4i]/2
x₁ = (6 + 4i]/2 Sacas factor comun 2
x₁ = 2(3 + 2i)/2 Simplificas el 2
x₁ = 3 + 2i
o
x₂ = (6 - 4i)2 Sacas factor comun 2
x₂ = 2(3 - 2i)/2 Simplificas el 2
x₂ = 3 - 2i
Solucion.
[(3 + 2i) , (3 - 2i)]