anonymous
  • anonymous
write the equation y=-x^2-3x in vertex form. What is the vertex and the axis of symmetry?
Mathematics
jamiebookeater
  • jamiebookeater
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Mertsj
  • Mertsj
You need to complete the square.
Mertsj
  • Mertsj
First factor out the negative 1
anonymous
  • anonymous
ok, then

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Mertsj
  • Mertsj
Complete the square
anonymous
  • anonymous
thats what i dont know how to do
Mertsj
  • Mertsj
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.
Mertsj
  • Mertsj
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.
anonymous
  • anonymous
ill try them both thanx again,,, looks like your saving my life tonight XD

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