SOLUTION: x2+4x=16 what is the solution?

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Question 436018: x2+4x=16 what is the solution?
Answer by jorel1380(3719)   (Show Source): You can put this solution on YOUR website!
x2+4x=16
x2+4x-16=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=80 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

Again, the answer is: 2.47213595499958, -6.47213595499958. Here's your graph:
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