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= x² - 15x - 15x + 225
= x² - 30x + 225
2. x² + 9x + 20 = (x + 4) (x + 5)
= x² + 5x + 4x + 20
= x² + 9x + 20
3. a. x² + 10x + 24 = (x + 4) (x + 6)
= x² + 6x + 4x + 24
= x² + 10x + 24
b. 3x² + 22x - 16 = (3x - 2) (x + 8)
= 3x² + 24x - 2x - 16
= 3x² + 22x - 16
2.(x+4)(x+5)
3.a.(x+4)(x+6)
b.(3x-2)(x+8)