SOLUTION: I need to find out how to work this problem y2-2y-4=0

Question 532147: I need to find out how to work this problem y2-2y-4=0
Answer by oberobic(2304) (Show Source): You can put this solution on YOUR website!
I assume you mean

.
Use the quadratic equation
.

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=20 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 3.23606797749979, -1.23606797749979. Here's your graph:

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