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( a = 1 , b = -5 , c = -1)
p + q = -b/a = 5/1 = 5
p.q = c/a = -1/1 = -1
akar-akar baru :
(2p + 1) + (2q + 1) = 2(p+q) + 2
= 2(5) + 2 = 12
(2p + 1)(2q + 1) = 4pq + 2(p+q) + 1
= 4.-1 + 2(5) + 1 = 7
persamaan kuadrat baru :
x2 - (p+q)x + pq = 0
x2 - 12x + 7 = 0