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x² - 14x + 49 = 0 Factorizas trinomio al cuadrado perfecto.
(x - 7)² = 0 Tiene como solución 2 raices reales iguales
(x - 7)(x - 7) = 0
x - 7 = 0
x = 7
Solución.
x = 7
Factorizamos:)
x²-14x₊49=0
↓ ↓
x -7 = -7x
x -7 = -7x
-------
-14x
∴(x-7)(x-7)
→ x-7=0
x=7
Rpta: 7