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b) 3x(4-5x) = 12x - 15x²
c) (4a-7)(8-3a) = 32a -12a²- 56+21a
=12a² + 53a -56
b) 12x - 15x^2
c) 32a - 12a^2 - 56 + 21a = 53a- 12a^2 - 56