anonymous
  • anonymous
The x-intercepts of a parabola are 5 and -7. What is the equation of the axis of symmetry?
Mathematics
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anonymous
  • anonymous
The x-intercepts of a parabola are 5 and -7. What is the equation of the axis of symmetry?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
help please
anonymous
  • anonymous
how wud i get the ans
Hero
  • Hero
(x-5)(x+7) = 0

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Hero
  • Hero
You can use that to at least get the parabola. After that, you have to complete the square
anonymous
  • anonymous
how though
anonymous
  • anonymous
can yu show me the steps please.
Hero
  • Hero
x^2+2x-35 = 0 x^2+2x = 35 x^2+2x+1 = 35+1 (x+1)^2 = 36
Hero
  • Hero
You really didn't need to do all of that however
amistre64
  • amistre64
since the vertex is halfway between the intercepts: add them up and divide by 2
Hero
  • Hero
amistre, I was getting to that
anonymous
  • anonymous
so 7+5/2
anonymous
  • anonymous
?
amistre64
  • amistre64
there is no +5 in there :)
amistre64
  • amistre64
but heros got it
amistre64
  • amistre64
symetry means : same on both sides; so if your in the middle your symetric
Hero
  • Hero
Actually, for that equation, I think they want you to write y = (x+1)^2 - 36
amistre64
  • amistre64
nah, x=-1 is it
amistre64
  • amistre64
the eq for the axis of sym
Hero
  • Hero
Oops, well in that case (5-7)/2

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