| a) (2x + 1)(3x - y + 2) = 6x² - 2xy + 4x + 3x - y + 2 = |
| 6x² - 2xy + 7x - y + 2 |
| b) (2y + 6x - 4)(5x - 3y) = 10xy - 6y² + 30x² - 18xy - 20x + 12y = |
| 30x² - 20x - 8xy - 6y² + 12y |
| c) (6r - 8s + 10t)(4t + 2s - r) = |
| 24rt + 12rs - 6r² - 32st - 16s² + 8rs + 40t² + 20st - 10rt = |
| - 6r² + 20rs + 14rt - 16s² - 12st + 40t² |
| d) (x² + 2x + 2)(x² - x - 1) = |
| x^4 - x³ - x² + 2x³ - 2x² - 2x + 2x² - 2x - 2 = |
| x^4 + x³ - x² - 4x - 2 |
| e) (x + 2)(x + 3)(x + 4) = |
| (x² + 5x + 6)(x + 4) = |
| x³ + 4x² + 5x² + 20x + 6x + 24 = x³ + 9x² + 26x + 24 |
| f) (a - 1)(2 + a)(a - 2) = |
| (2a + a² - 2 - a)(a - 2) = (a² + a - 2)(a - 2) = |
| a³ - 2a² + a² - 2a - 2a + 4 = a³ - a² - 4a + 4 |
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