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b. 5x pangkat 2 - x + 25 x - 5 = 5 x pangkat 2 + 24 x -5
c. 14 x - 49 - 4x pangkat 2 + 14 x = -4x pangkat 2 + 28 x - 49
b. (x + 5)(5x-1)= 5x²-x+25x-5
= 5x² + 24x - 5
c. (7 - 2x)x(2x - 7)= 7 - 2x + 2x² - 7x
= 2x² - 9x +7
maaf kalo salah
semoga membantu