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x1= x2
x1+x2 = -b/a
2x1 = p/9
x1.x2 = c/a
x1² = 16/9
x1 = 4/3
dimasukkan ke x1+x2
2 ( 4/3) = p /9
8/3 = p / 9
72 = 3p
p = 24
d = b² - 4ac
p² - 4(9)(16) = 0
p² = 576
p = √576
p = 24