1) 5a(a⁴ - 6a² + 3 ) = 5a⁵ - 30a³+15a

2) (x + 4)(3x - 2) = 3x² - 2x + 3x - 8 = 3x² + x - 8

3) (6m + 5n)(7m - 3n) = 42m² - 18mn + 35mn -15 n² = 42m² - 15n² + 17mn

4) (x + 5)(x² + x - 6) = x³ + x² - 6x + 5x² + 5x - 30 = x³ + 6x² - x - 30

1) 5a(a⁴ - 6a² + 3 ) = 5a⁵ - 30a³ + 15a

2) (x + 4)(3x - 2) = 3x² - 2x + 12x - 8 = 3x² + 10x - 8

3) (6m + 5n)(7m - 3n) = 42m² - 18mn + 35mn -15 n² = 42m² + 17mn - 15n²

4) (x + 5)(x² + x - 6) = x³ + x² - 6x + 5x² + 5x - 30 = x³ + 6x² - x - 30