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(a + b)² = a² + 2ab + b²
(x + 2y )² =
x² + 2(x)(2y) + (2y)² =
x² + 4xy + 2²y² =
x² + 4xy + 4y²
(a - b)² = a² - 2ab + b²
(2m - n)² =
(2m)² - 2(2m)(n) + n² =
2²m² - 4mn + n² =
4m² - 4mn + n²
ejemplo: