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x² + 16x + 15 = ( x + 1 ) ( x + 15 )
b).
10x² - 7x - 12 = ( 5x + 4 ) ( 2x - 3 )
c).
4x² + 13x - 12 = ( x + 4 ) ( 4x - 3 )
d).
2x² - 11x + 15 = ( 2x - 5 ) ( x - 3 )