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x² + 18x = 0 Factorizas sacas factor comun x
x(x + 18) = 0 Tiene como solución dos raices reales
x = 0
o
x + 18 = 0
x = - 18
Solución.
(0 , -18)
x1= (-18+(raíz de) 18^2-4×1×0)/2
=(-18+18)/2
=0
x2=(-18-(raíz de) 18^2-4×1×0)/2
=(-18-18)/2
=-36/2
= -18
x1=0 y x2=-18