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a = 1
b = a
c = -4
mis. akar"nya adalah p dan q
p+q = -b/a
= -a/1
= -a
p×q = c/a
= -4/1
= -4
p²-2pq+q² = 8a
persamaan diatas dapat diubah bentuknya menjadi :
(p+q)²-4pq = 8a
(-a)²-4(-4) = 8a
a²+16 = 8a
a²-8a+16 = 0
(a-4)(a-4) = 0
a-4 = 0
a = 4
jadi, nilai a yang memenuhi ialah 4