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b. (7-2x)×(2x-7) = -4x pangkat 2 + 28x - 49
= 5x pangkat 2 - x + 25x -5
= 5x pangkat 2 + 24x -5
b. (7-2x)(2x-7)
= 14x + 49 - 4x pangkat 2 + 14x
= 14 x + 14x +49 - 4x pangkat 2
= 28x + 49 - 4x pangkat 2