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Verified answer
1a.12m - 18n
= 6(2m - 3n)
1b.
9xy² + 15x³
= 3x(3y² + 5x²)
1c.
ac + bc + ad + bd
= (ac + bc) + (ad + bd)
= c(a + b) + d(a + b)
= (a + b)(c + d)