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a. ( x + 2 )² = x² + 2 × x × 2 + 2² = x² + 4x + 4
b. 3( 2x - 1 )² = 3 ( 4x² - 4x + 1 ) = 12x² - 12x + 3
3(4x^2-1(2x-1))
3(8x^3 - 4x^2 - 2x + 1)
24x^3 - 12x^2 - 6x + 3