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= 2x² + 7x + 6
4) (2x - 3)(x + 3) = 2x² + 6x - 3x - 9
= 2x² + 3x - 9
5) (x - 3)(x + 3) = x² - 9
6) (x + 3)² = x² + 6x + 9
4) (2x-3)(x+3) = 2x² + 6x - 3x -9 = 2x² + 3x -9
5) (x-3)(x+3) = x² + 3x - 3x -9 = x² -9
6) (x+3)² = (x+3)(x+3) = x² + 3x + 3x + 9 = x² + 6x + 9
7) (x+2)(x-2) = x² - 2x + 2x - 4 = x² - 4
8) (2x+5)(2x-5) = 4x² - 10x + 10x - 25 = 4x² - 25
9) (2x-1)² = (2x-1)(2x-1) = 4x² - 2x - 2x + 1 = 4x² - 4x + 1
10)(-2x+1)(2x+1) = - 4x² - 2x + 2x + 1 = 4x² + 1 ..
priksa kmbali