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p² - 2pq + q² = 6
(p² + q²) - 2pq = 6
(p + q)² - 4pq = 6
Diberikan:
p + q = -b/a = -4/2 = 2
pq = c/a = (m-1)/2
maka,
2² - 4((m-1)/2) = 6
4 - 2(m-1) = 6
2(m-1) = 4 - 6
2(m-1) = -2
m-1 = -1
m = -1 + 1
m = 0
b²-4ac=0
4²-4.2.m=0
-8m=-16
m=2
maka
2x²+4x+2,menjadi
x²+2x+1=(x+1)(x+1)
x=p=q=-1 untuk yg pertama
jadi yg kedua truskan