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c.) 3(x²+2x+1) = 3x² +6x +3
e.) = 7(1+2x)+9(-2x - 1)
=7 +14x -18x -9
= -4x -2
f.) = 6(2 + 3x) + 2(2x²-4x+6)
= 12 + 18x + 4x² -8x + 12
= 4x² +10x +24