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x"-4x-5 =0
(x-5) (x+1)
jadi x nya 5 atau -1
sebaliknya jika memotong sumbu y maka x = 0
x² - 4x - 5 = 0
(x + 1)(x - 5) = 0
x = -1 atau x = 5
maka titik potongnya di (-1,0) dan (5,0)