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(a + b)² = a² +2ab +b²
(a - b)² = a² - 2ab + b²
(2 + 3x)² = 2² +2(2)(3x) + (3x)² = 4 + 12x + 9x²
(2ab + 3a)² = (2ab)² + 2(2ab)(3a) + (3a)² = 4a²b² +12a²b +9a²
(2a - b)² = (2a)² -2(2a)(b) +b² = 4a² - 4ab + b²
(2xyz - a)² = (2xyz)² - 2(2xyz)(a) +a² = 4x²y²z² -4xyza +a²