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(a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
Ejemplos.
(2x + y)² =
(2x)² + 2(2x)(y) + y²
2²x² + 4xy + y²
4x² + 4xy + y²
(3x - 2y) =
(3x)² - 2(3x)(2y) + (2y)² =
3²x² - 12xy + 2²y²
9x² - 12xy + 4y²