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