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= (5a x -3) + (5a x 4y)
= -15a + 20ay
2. -2a (-44² + 3ab)
= (-2a × -44²) + (-2a × 3ab)
= 3872a + (-6a²b)
3. 4x² ( 3x² - 2xy²)
= (4x² × 3x²) + (4x² × -2xy²)
= 12x^4 + (-8x³y²)
4. a (32 + 2ab)
= (a×32) + (a × 2ab)
= 32a + 2a²b
5. (3a - 5b) (7a + 4b)
= (3a × 7a) (-5b ×4b)
= 21a² - 20b²
6. (6x + 7y) (2x - 4y)
= (6x × 2x) (7y × -4y)
= 12x² - 28y²
7. (2a - 3b) (4a - 5b)
= (2a × 4a) (2a×-5b) (-3b × 4a) (-3b × 5b)
= 8a² -10ab - 12ab - 15b²
= 8a² - 22ab - 15b²
8. (2a + 3b) (4a² -5a + 2ab)
= (2a × 4a²) (2a × -5a) (2a × 2ab) (3b × 4a²) (3b × -5a) (3b × 2ab)
= 8a³ -10a² +4a²b+12a²b - 15ab + 6ab²
= 8a³ -10a² +16a²b - 15ab + 6ab²