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a = 1
b = a
c = -4
p² - 2pq + q² = (p - q)²
p - q = √D / a
(p - q)² = D / a²
b² - 4ac / a²
= a² - 4(1)(-4) / 1²
= a² + 16
a² + 16 = 8a
a² - 8a + 16 = 0
(a - 4)(a - 4)
a - 4 = 0
a = 4
Jadi nilai a = 4