SOLUTION: Hi. The problem is -x^2 - 8x - 7. I just need the vertex of the parabola. Thank you.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Hi. The problem is -x^2 - 8x - 7. I just need the vertex of the parabola. Thank you.      Log On


   

Question 204149This question is from textbook
: Hi. The problem is -x^2 - 8x - 7. I just need the vertex of the parabola. Thank you. This question is from textbook

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The problem is -x^2 - 8x - 7. I just need the vertex of the parabola. Thank you.
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Set it equal to 0.
x^2 + 8x + 7 = 0 (divided by -1)
The vertex is at x = -b/2a
x = -8/2 = -4
Solve for y, or f(x) by subbing -4 for x.
y = 16 - 32 + 7
y = -9
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The vertex is (-4,-9)