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anonymous

  • 4 years ago

The x-intercepts of a parabola are 5 and -7. What is the equation of the axis of symmetry?

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  1. anonymous
    • 4 years ago
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    help please

  2. anonymous
    • 4 years ago
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    how wud i get the ans

  3. Hero
    • 4 years ago
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    (x-5)(x+7) = 0

  4. Hero
    • 4 years ago
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    You can use that to at least get the parabola. After that, you have to complete the square

  5. anonymous
    • 4 years ago
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    how though

  6. anonymous
    • 4 years ago
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    can yu show me the steps please.

  7. Hero
    • 4 years ago
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    x^2+2x-35 = 0 x^2+2x = 35 x^2+2x+1 = 35+1 (x+1)^2 = 36

  8. Hero
    • 4 years ago
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    You really didn't need to do all of that however

  9. amistre64
    • 4 years ago
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    since the vertex is halfway between the intercepts: add them up and divide by 2

  10. Hero
    • 4 years ago
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    amistre, I was getting to that

  11. anonymous
    • 4 years ago
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    so 7+5/2

  12. anonymous
    • 4 years ago
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    ?

  13. amistre64
    • 4 years ago
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    there is no +5 in there :)

  14. amistre64
    • 4 years ago
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    but heros got it

  15. amistre64
    • 4 years ago
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    symetry means : same on both sides; so if your in the middle your symetric

  16. Hero
    • 4 years ago
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    Actually, for that equation, I think they want you to write y = (x+1)^2 - 36

  17. amistre64
    • 4 years ago
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    nah, x=-1 is it

  18. amistre64
    • 4 years ago
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    the eq for the axis of sym

  19. Hero
    • 4 years ago
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    Oops, well in that case (5-7)/2

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spraguer (Moderator)
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