SOLUTION: Solve x^2 + 8x + 20 = 0 using the quadratic formula

Question 456251: Solve x^2 + 8x + 20 = 0 using the quadratic formula
Found 2 solutions by Alan3354, MathLover1:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!

Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc)

Quadratic equation (in our case ) has the following solutons:

For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

The discriminant -16 is less than zero. That means that there are no solutions among real numbers.

If you are a student of advanced school algebra and are aware about imaginary numbers, read on.

In the field of imaginary numbers, the square root of -16 is + or - .

The solution is , or
Here's your graph:

-----------
x = -4 � 2i

Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

solutions:

or

graph:

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