SOLUTION: Hi. I need this equation graphed also need to find the coordinates of the vertex. The problem is y= -x^2 - 8x - 7. Thank You Very Much.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Hi. I need this equation graphed also need to find the coordinates of the vertex. The problem is y= -x^2 - 8x - 7. Thank You Very Much.      Log On


   

Question 204116This question is from textbook
: Hi. I need this equation graphed also need to find the coordinates of the vertex.
The problem is y= -x^2 - 8x - 7. Thank You Very Much. This question is from textbook

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
I need this equation graphed also need to find the coordinates of the vertex.
The problem is y= -x^2 - 8x - 7
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You could answer this by completing the square or
by doing the following:
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The vertex occurs where x = -b/(2a) = 8/(2*-1) = -4
The corresponding y-value is f(-4) = -16 +32 -7 = 9
The vertex is (-4,9)
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graph%28400%2C300%2C-20%2C20%2C-20%2C20%2C-x%5E2-8x-7%29
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Cheers,
Stan H.