SOLUTION: Use the quadratic formula to solve the equation x^2-4x-9=0

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Question 344602: Use the quadratic formula to solve the equation x^2-4x-9=0
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
x^2-4x-9=0
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=52 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

Again, the answer is: 5.60555127546399, -1.60555127546399. Here's your graph:
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