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1- x² = x² - 1
x² + x² -1 - 1= 0
2x² - 2 = 0
2(x²- 1) = 0
x² - 1= 0
x² = 1
x = 1 atau x = -1
.
untuk x = 1 --> y = x² -1 = 1-1 = 0 --> (1,0)
untuk x = -1 --> y =(-1)² -1 = 0 --> (-1, 0)
titk potongnya di (1,0) dan (-1,0)