gKateycharigi gKateycharigi
  • 11-11-2016
  • Mathematics
contestada

write y=-3x^2+12x-21 in vertex form
A)y=-3(x-2)^2-9
B)y=-3(x+2)^2-9
C)y=-3(x+2)^2+9
D)y=-3(x-2)^2+9

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TheMoonWalker
TheMoonWalker TheMoonWalker
  • 12-11-2016
Complete the square: 
y = 3x^2 - 12x + 4 
y = 3(x^2 - 4x) + 4 
y = 3(x^2 - 4x + 4 - 4) + 4 
y = 3(x^2 - 4x + 4) - 12 + 4 
y = 3(x - 2)^2 - 8
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syed514
syed514 syed514
  • 16-11-2016
The vertex form of any function is : f(x) = a(x-h)^2 + k
 Hence the correct option would be: A): "-3(x-2)^2-9"
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