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x(x + 15) + 4(x + 15)
2x² + 15x + 4x + 60
2x² + 19x + 60
2. (2x - 5) (2x + 3)
2x(2x + 3) - 5(2x + 3)
4x² + 6x - 10x - 15
4x² - 4x - 15
3. (4x + 3) (9 - 5x)
4x(9 - 5x) + 3(9 - 5x)
36x - 20x² + 27 - 15x
36x - 15x - 20x² + 27
21x - 20x² + 27
4. (8 - 5x) (9 - 5x)
8(9 - 5x) - 5x(9 - 5x)
72 - 40x - 45x + 25x²
72 - 85x + 25x²