1) 25a2b4 = 100a × 2b = 200ab
2) (x3)2 - x × x2 = - 1
(3x)2-2x^2 - 1 = 3x × 2 - 2x^2 - 1 = 6x - 2x^2 - 1 = -2x^2 + 6x -1
1) 25a2b4 = 100a × 2b = 200ab
2) (x3)2 - x × x2 = - 1
(3x)2-2x^2 - 1 = 3x × 2 - 2x^2 - 1 = 6x - 2x^2 - 1 = -2x^2 + 6x -1