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a) (4x10+6)(3x10+6) = 4 x 3 exp 6+6 = 12 exp 12
b) (3x10+2)(5x10+4) = 3 x 5 exp 2+4 = 15 exp 6
c) (4x10-2) (5x10+4)(3x10+3) = 4 x 5 x 3 exp -2+4+3 =60 exp +5