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B. (3x + 5)(2x - 3)
x² -x -14x +14
(x² -x) -(14x -14)
x(x -1) -14(x -1)
= (x -14) (x -1)
b. 6x² +x -15
6x² +10x -9x -15
(6x² +10x) -(9x +15)
2x(3x +5) -3(3x +5)
= (2x -3) (3x +5)