SOLUTION: how do u slove -b + square root b to the second power subtract 4ac over 2a to slove n to the second power subtract 8n-4=0? using the quadratic formula step by step??

Question 48139: how do u slove -b + square root b to the second power subtract 4ac over 2a to slove n to the second power subtract 8n-4=0? using the quadratic formula step by step??
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
n^2- 8n -4=0
n=[8+-sqrt(64-4(-4)/2
n=[8+-sqrt80]/2
n=[8+-4sqrt(5)]/2
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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: 8.47213595499958, -0.47213595499958. Here's your graph:

Hope this helps.
Cheers,
Stan H.
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