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(1) |
![]() |
(2) |
Now we can apply the binomial equation:
![]() |
(3) |
We take the square root on both sides of the equation
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(4) |
to get
![]() |
(5) |
The expression in the root
![]() |
(6) |
is called ``discriminant''. The quadratic equation has two real roots
for and none for
. If
,
we have a double root.