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thatjacksonguy

  • 3 years ago

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

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  1. Mertsj
    • 3 years ago
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    You need to complete the square.

  2. Mertsj
    • 3 years ago
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    First factor out the negative 1

  3. thatjacksonguy
    • 3 years ago
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    ok, then

  4. Mertsj
    • 3 years ago
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    Complete the square

  5. thatjacksonguy
    • 3 years ago
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    thats what i dont know how to do

  6. Mertsj
    • 3 years ago
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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.

  7. Mertsj
    • 3 years ago
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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.

  8. thatjacksonguy
    • 3 years ago
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    ill try them both thanx again,,, looks like your saving my life tonight XD

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