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Itu artinya, x1² + x2² = (x1+x2)² - 2x1x2
x² + (p-3)x + 4 = 0
a = 1
b = p-3
c = 4
x1 + x2 = -b/a
= -(p-3) / 1
= -p + 3
x1x2 = c/a
= 4/1
= 4
(x1+x2)² - 2x1x2 = p - 5
(-p + 3)² - 2.4 = p - 5
p² - 6p + 9 - 8 - p + 5 = 0
p² - 7p + 6 = 0
(p - 6)(p - 1)
p - 6 = 0
p = 6
p - 1 = 0
p = 1
Jadi p = 6 atau p = 1
Jadi, p = 6 atau p = 1