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Caso trinomio al cuadrado perfecto
Aplicas.
a² - 2ab + b² =
(a - b)²
x² - 18xy + 81y² =
x² - 2(x)(9y) + 9²y² =
(x - 9y)²
z² - 12zw + 36w² =
z²- 2(z)(6w) + 6²w² =
(z - 6w)²
Trinomio especial de la forma x² + bx +c
x² - 9xy + 20y²
x - 5
x - 4
(x - 5y)(x - 4y)