SOLUTION: Can I have some help with this one please? y = x2 - 2x - 15 I have to find all these for the equation: a.The y-intercept b.The x-intercepts if possible c.The vertex d. Th

Question 278845: Can I have some help with this one please?
y = x2 - 2x - 15
I have to find all these for the equation:
a.The y-intercept
b.The x-intercepts if possible
c.The vertex
d. The line of symmetry
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!

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=64 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 5, -3. Here's your graph:

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