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-x² - 2x + 35
= -x² - 7x + 5x + 35
= -x(x + 7) + 5(x + 7)
= (x + 7)(5 - x)
x² - 25 = (x + 5)(x - 5)
= (x + 7)(5 - x) / (x + 5)(x - 5)
= - (x + 7)/(x + 5)
keterangan : (a - b)/(b - a) = -1
smgmbntu ya kalau boleh jadikan terbaik ya^^