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kan udah diketahui (1,0) ; (3,0) ; (0,3)
berarti pembuat nolnya dari x
(x-1) dan (x-3). terus dikalikan
(x-1)(x-3) = x² - 4x + 3.
terus dibuktikan pake (0,3)
x² - 4x + 3 = y
(0)² - 4(0) + 3 = 3
3 = 3 ( terbukti)