anonymous
  • anonymous
The vertex of this parabola is at (5,-4). Which of the following could be its equation? A. y=2(x-5)^2-4 B. y=2(x+5)^2-4 C. y=2(x+5)^2+4 D. y=2((x-5)^2+4
Geometry
chestercat
  • chestercat
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alekos
  • alekos
general vertex form is y=a(x-h)^2 +k where (h,k) is the vertex
alekos
  • alekos
c'mon its up to zombash to work that out
anonymous
  • anonymous

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anonymous
  • anonymous
|dw:1434833402909:dw|
welshfella
  • welshfella
compare the general form with each of the options and compare term by term
anonymous
  • anonymous
..?
anonymous
  • anonymous
I am terrible with this parabola stuff ;~;
Haseeb96
  • Haseeb96
@ZoMbAsH as we know point lie at 4th quadrant okay?
anonymous
  • anonymous
How does that help though?
welshfella
  • welshfella
for example:- y= a(x-h)^2 +k y =2(x+5)^2 +4 h = -5 and k = 4 so vertex is (-5,4) which is not what you want ( you need (5,-4) ) so its not option 2
anonymous
  • anonymous
Alright, that helps.
welshfella
  • welshfella
- sorry - not option c
anonymous
  • anonymous
Off the bat I thought it was B
welshfella
  • welshfella
try comparing B
ybarrap
  • ybarrap
|dw:1434834213217:dw|

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