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3x² + 24x = - 45 Simplificas sacas tercera
x² + 8x = - 15
x² + 8x + 15 = 0 Factorizas trinomio de la forma x² + bx + c
(x + 5)(x + 3) = 0 Tiene como solución dos raices reales distintas
x + 5 = 0
x = - 5
o
x + 3 = 0
x = - 3
Solución.
(- 5 , - 3)
3x²+24x+45=0
3(x²+8x+15)=0
(x+5) · (x+3)=0÷3
(x+5) · (x+3)=0
x+5=0 ⇒x1=5
x+3=0 ⇒x2=3