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7x - 3 = x² + px + 1
x² + (p-7)x +4 = 0
agar garis tidak memotong kurva maka D<0
b² - 4.a.c < 0
(p-7)² - 4.1.4 < 0
p² - 14p + 49 - 16 < 0
p² - 14p + 33 < 0
(p - 11)(p - 3)<0
3 < p < 11