How do you find the discriminant #x^2+2x+8=0#?

1 Answer
Johnson Z.
Feb 28, 2016

#D=-28#

Explanation:

The discriminant can be found by using the discriminant formula:

#b^2-4ac#

Finding the Discriminant
#1#. Determine the #a#, #b#, and #c# values of the quadratic equation. In your case, #a=1#, #b=2#, and #c=8#. Substitute these values into the discriminant formula.

#b^2-4ac#

#=(2)^2-4(1)(8)#

#2#. Solve.

#=4-32#

#=color(green)(-28)#

#:.#, the discriminant is #-28#.

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