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thatjacksonguy Group Title

write the equation y=-x^2-3x in vertex form. What is the vertex and the axis of symmetry?

  • one year ago
  • one year ago

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  1. Mertsj Group Title
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    You need to complete the square.

    • one year ago
  2. Mertsj Group Title
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    First factor out the negative 1

    • one year ago
  3. thatjacksonguy Group Title
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    ok, then

    • one year ago
  4. Mertsj Group Title
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    Complete the square

    • one year ago
  5. thatjacksonguy Group Title
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    thats what i dont know how to do

    • one year ago
  6. Mertsj Group Title
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    Take 1/2 of the coefficient of x and square it. Add that to the x^2 and x term (which is really subtracting it since there is a minus sign outside the parentheses) so then add it again.

    • one year ago
  7. Mertsj Group Title
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    There is an alternate way that might be easier. The x coordinate of the vertex is -b/2a. Calculate that then plug it back in to find the y coordinate. The axis of symmetry is the vertical line that goes through the vertex.

    • one year ago
  8. thatjacksonguy Group Title
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    ill try them both thanx again,,, looks like your saving my life tonight XD

    • one year ago
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