SOLUTION: x(squared)-18x-40=0

Question 70804: x(squared)-18x-40=0
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

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=484 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 20, -2. Here's your graph:

Remember this is only one branch of the quadratic and it is not a straight line (the other x-intercept is at x=20).
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