SOLUTION: z^2 + 12z + 15

Question 266938: z^2 + 12z + 15
Answer by JBarnum(2146) (Show Source): You can put this solution on YOUR website!
A=1 B=12 C=15

Solved by pluggable solver: SOLVE quadratic equation with variable

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 : .

Discriminant d=84 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: -1.41742430504416, -10.5825756949558. Here's your graph:

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