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b.(x + 5 ) x (5x - 1) = 5x pangkat 2 - x + 25x - 5 = 5x pangkat 2 +24x -5
c.(7 - 2x) x (2x - 7) = 14x - 49 - 4x pangkat 2 + 14x = - 4x pangkat 2 + 14x + 14x - 49 = -4x pangkat 2 + 28x -49
b. 5x² -x + 25x - 5
= 5x² +24x -5
c. 14x -49 -4x² + 14x
= -4x² +28x -49