3,x2 + 3x + 9 = 0

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Solution

We have x 2 +3x+9=0 .

Any equation of the form a x 2 +bx+c=0 has the solution

x= −b± D 2a

Here, D= b 2 −4ac is called the discriminant of the quadratic equation.

Therefore,

x= −3± −27 2 = −3± 27 i 2

Thus, x= −3± 27 i 2 .

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