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anonymous

  • one year ago

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

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    @mathstudent55 @mathmate @dan815 @Teddyiswatshecallsme

  3. dan815
    • one year ago
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    thats not a parabola

  4. anonymous
    • one year ago
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    Yeah well the question is worded like that ._.

  5. dan815
    • one year ago
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    the picture u put up is not a parabola i mean the equation is that of a parabola

  6. anonymous
    • one year ago
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  7. anonymous
    • one year ago
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    I mistaken ._.

  8. dan815
    • one year ago
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    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

  9. dan815
    • one year ago
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    x=10 is the axis of symmetry

  10. dan815
    • one year ago
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    http://prntscr.com/82t7tw As u can see along this line its a complete reflection

  11. dan815
    • one year ago
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    so its "symmetric" along that line

  12. anonymous
    • one year ago
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    Thank you very much dan :D

  13. dan815
    • one year ago
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    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

  14. anonymous
    • one year ago
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    Ok understood :P

  15. dan815
    • one year ago
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    i hope you really REALLY REALLY understand it

  16. anonymous
    • one year ago
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    Yes I do thanks Dan!

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