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a. 2(x+4) = 2x + 8
c. 5(3x+2y) = 15x + 10y
2.
a. (2x-3)(x+5) = 2x²+10x-3x-15
= 2x²+7x-15
c. (5m-1)(m+4) = 5m² + 20m-m-4
= 5m²+19m-4
3.
a. ab(a+2b-c) = a²b + 2ab² -abc
c. 2xy(x-3y) = 2x²y - 6xy²