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anonymous

  • 5 years ago

Write an equation for the parabola with a vertex at (2, -1) and y-intercept 5.

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  1. saifoo.khan
    • 5 years ago
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    \[y = (x - 2)^2 -1\]

  2. amistre64
    • 5 years ago
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    when x=0 that equals 3 tho, not 5

  3. saifoo.khan
    • 5 years ago
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    Messed up.. o_O

  4. saifoo.khan
    • 5 years ago
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    Yeah..

  5. saifoo.khan
    • 5 years ago
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    figured//

  6. amistre64
    • 5 years ago
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    gotta scale it right?

  7. amistre64
    • 5 years ago
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    5 = a(-2)^2-1

  8. amistre64
    • 5 years ago
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    its a good start tho, get the basic down and fidget with it

  9. anonymous
    • 5 years ago
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    That was what the question asked, I am confused on how to calculate (a)

  10. amistre64
    • 5 years ago
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    a is just a single unknown that can be algebraed into submission

  11. amistre64
    • 5 years ago
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    add 1 and divide off the (-2)^2

  12. anonymous
    • 5 years ago
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    My algebra teacher said the answer was \[3/2(x-2)^{2}\]

  13. anonymous
    • 5 years ago
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    PLus 1 at the end sorry

  14. amistre64
    • 5 years ago
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    almost, missing the -1 at the end tho

  15. anonymous
    • 5 years ago
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    oh minus?

  16. anonymous
    • 5 years ago
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    Ok so how did he get 3 halves?

  17. amistre64
    • 5 years ago
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    5 = a(-2)^2 - 1 +1 +1 ---------------- 6 = a(4) /4 /4 --------- 6/4 = a

  18. amistre64
    • 5 years ago
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    this is basic equation manipulations; you will need to become quite adept at it for further math skills

  19. anonymous
    • 5 years ago
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    You put in the y intercept (5) in for x?

  20. amistre64
    • 5 years ago
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    when x=0, y=5 so we zero out the x and replace y by 5

  21. amistre64
    • 5 years ago
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    y = a(x-2)^2 - 1 5 = a(-2)^2 - 1

  22. anonymous
    • 5 years ago
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    Is it also possible to substitute h and k as well instead?

  23. amistre64
    • 5 years ago
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    h and k are your vertex elements

  24. amistre64
    • 5 years ago
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    we plugged those in to determine "a"

  25. anonymous
    • 5 years ago
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    oh ok i get it (hopefully) thank you

  26. amistre64
    • 5 years ago
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    practice helps :)

  27. saifoo.khan
    • 5 years ago
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    Practise makes a man perfect. ;)

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