SOLUTION: My question is graph the following equation: y = 2x(squared) - 8 how do i graph this...and how do i do the problem algebratically?

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Question 356823: My question is graph the following equation: y = 2x(squared) - 8
how do i graph this...and how do i do the problem algebratically?
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
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=64 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

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