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b. (y-3) (y+24)
c. (a+4) (a+2)
y² - 19y + 60
= ( y - 4 ) ( x - 15 )
y² + 21y - 72
= ( y + 24 ) ( y - 3 )
a² + 6a + 8
= ( a + 4 ) ( a + 2 )