anonymous
  • anonymous
A graph of a quadratic function is shown below. graph of y equals negative 2 times x squared plus 40 x plus 600 Which of the following equations represents the axis of symmetry for the parabola shown? y = 10x x = 10 x = y + 10 y = x + 10
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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anonymous
  • anonymous
dan815
  • dan815
thats not a parabola

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anonymous
  • anonymous
Yeah well the question is worded like that ._.
dan815
  • dan815
the picture u put up is not a parabola i mean the equation is that of a parabola
anonymous
  • anonymous
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anonymous
  • anonymous
I mistaken ._.
dan815
  • dan815
y equals negative 2 times x squared plus 40 x plus 600 y=-2*x^2+40x+600 =-2(x^2-20x-300) =-2( (x-30)(x+10) ) the roots are x=30 and x=-10 the mid point is at (30+-10)/2 = 10
dan815
  • dan815
x=10 is the axis of symmetry
dan815
  • dan815
http://prntscr.com/82t7tw As u can see along this line its a complete reflection
dan815
  • dan815
so its "symmetric" along that line
anonymous
  • anonymous
Thank you very much dan :D
dan815
  • dan815
that is the line x=10 because if u look at the coordinates along that vertical line, all its x coordinates of its points have 10 in it
anonymous
  • anonymous
Ok understood :P
dan815
  • dan815
i hope you really REALLY REALLY understand it
anonymous
  • anonymous
Yes I do thanks Dan!

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