anonymous
  • anonymous
Which of the following is the vertex of the quadratic equation y = 6x2 + 24x + 16?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Use the formula: -b/2a to find your axis of symmetry, sub that in, to find the y coordinate.
anonymous
  • anonymous
was this originally a multiple choice question? Your question implies it is, but there are no follow up options.
anonymous
  • anonymous
i got (2, 8)

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apoorvk
  • apoorvk
vertex of a quadratic equation' parabola = (-b/2a , -D/4a) where, D = Discriminant. \[D= \sqrt{b^2 - 4ac}\]
anonymous
  • anonymous
(–2, –8) (–2, 8) (2, –8) (2, 8)
anonymous
  • anonymous
these are the options
anonymous
  • anonymous
Try again
apoorvk
  • apoorvk
Err.. a wee bit of a mistake. should be (-2, -8)
anonymous
  • anonymous
can you work it out please? I don't understand
anonymous
  • anonymous
|dw:1334421718973:dw|
anonymous
  • anonymous
That gives you your axis of symmetry
anonymous
  • anonymous
|dw:1334421758630:dw|
anonymous
  • anonymous
(–2, –8) is the ans y=6(x^2+4x+4)-8 (y+8)=6(x+3)^2 therefore –2, –8) is the ans

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