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