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= 13a + 15b
2. 12 + 2(4x - 3) = 12 + 8x - 6
= 8x + 12 - 6
= 8x + 6
3. 8(3x + 4y) - 5(4x - 6y) = 24x + 32y - 20x + 30y
= 24x - 20x + 32y + 30y
= 4x + 62y
4. a(a + 3b) + 2a(4a + 5b) = a² + 3ab + 8a² + 10ab
= a² + 8a² + 3ab + 10ab
= 9a² + 13ab
5. 5x(4x - 3y) - 3x(5x + 2y) = 20x² - 15xy - 15x² - 6xy
= 20x² - 15x² - 15xy - 6xy
= 5x² - 21xy
6.(5a + 8) + (8a + 3) = 5a + 8 + 8a + 3
= 5a + 8a + 8 + 3
= 13a + 11