(a + b)² = a² + 2(a)(b) + b²
(a - b)² = a² - 2(a)(b) + b²
Ej.
(2 + x)² = 4 + 4x + x²
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(a + b)² = a² + 2(a)(b) + b²
(a - b)² = a² - 2(a)(b) + b²
Ej.
(2 + x)² = 4 + 4x + x²