SOLUTION: squareroot x+20-x=0 not sure what to do for this problem. Which x do you get ride of first the positive or negetive?

Question 146673: squareroot x+20-x=0
not sure what to do for this problem. Which x do you get ride of first the positive or negetive?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!

You might mean
I'll do this one:

Square both sides

Put in quadratic form

Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc)

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=81 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 25, 16. Here's your graph:

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