Question

x的平方-2(p -q)x-4pq=0

Answer 1

x的平方-2(p -q)x-4pq=0
则(x-2p)(x+2q)=0
所以x-2p=0或x+2q=0
所以x=2p或x=-2q

Answer 2

x^2-2(p -q)x-4pq=0
1 -2p
1 2q
2q-2p=-2(p-q)
(x-2p)(x+2q)=0
x=2p x=-2q