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= 5p + 5
b. 9p² - 4pq - q² - 4p² + 5pq - 3q² = (9p² - 4p²) + (-4pq + 5pq) + (q² - 3q²)
= 5p² + pq - 2q²
c. 12x³ - 9x² - 8 - 15x³ + 7x² + 5
= (12x³ - 15x³) + (-9x² + 7x²) + (-8 + 5)
= -3x³ - 2x² - 3
2. a. (2x - 3)(x + 4)
= 2x² + 8x - 3x - 12
= 2x² + 5x - 12
b. (2 + a)(a² - 2a + 1)
= 2a² - 4a + 2 + a³ - 2a² + a
= a³ - 3a + 2
= 8p-3p -3+8
= 5p+5
b. 9p² - 4pq - q² -4p² + 5pq - 3q²
= 9p²-4p²-4pq+5pq-q²-3q²
= 5p²+ 1pq - 4q²
c. 12x³ - 9x² - 8 -15x³ + 7x² + 5
= 12x³ - 15x³ - 9x²+7x² - 8 +5
= -3x³ - 2x² - 3
2. a. (2x - 3) (x + 4)
= 2x² + 8x - 3x - 12
= 2x² + 5x -12
b. (2 + a) (a² - 2a + 1)
= 2a² - 4a + 2 +a³ - 2a² + a
= a³ + 2a² - 2a² -4a + a + 2
= a³ -3a +2