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anonymous

  • 5 years ago

Turn 7y-4=8x^2-24x into the form y=a(x-h)^2+k to solve a parabola and its vertex, focus, directrix, and the axis of symmetry.

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  1. anonymous
    • 5 years ago
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    hey, how's it going?

  2. anonymous
    • 5 years ago
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    good, just a lil stressed trying to find the solution to this problem

  3. anonymous
    • 5 years ago
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    ok so we want to get the right side looking like a(x-h)^2

  4. anonymous
    • 5 years ago
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    yep, i was thinking to add 4 to both sides and then factor out an 8

  5. anonymous
    • 5 years ago
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    ok, that works, 7y = 8 (x^2 - 3x) + 4

  6. anonymous
    • 5 years ago
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    so to end up with the -3x term, we are going to need (x-3/2)^2

  7. anonymous
    • 5 years ago
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    but (x-3/2)^2 = x^2 -3x + 9/4, so we have to subtract that 9/4 from the right side of the equation since we added it to "complete the square"

  8. anonymous
    • 5 years ago
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    ok, so then it would be 7y - 9/4 = 8 (x - 3/2)^2 +4 so i wouldn't need to add the 4 on both sides in the first place?

  9. anonymous
    • 5 years ago
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    no, we added 9/4 to the right side, so we need to add it to the left side (or subtract it to the right)

  10. anonymous
    • 5 years ago
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    oh, sorry i meant + 7y + 9/4 = 8 (x - 3/2)^2 +4 7y = 8 (x - 3/2)^2 + 7/4 so it would end up like that?

  11. anonymous
    • 5 years ago
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    then we would divide it by 7 on both sides

  12. anonymous
    • 5 years ago
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    i'm sorry, i made a mistake we actually added 8*9/4

  13. anonymous
    • 5 years ago
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    so instead of 9/4 added to the left side, it would be 8(9/4) = 18

  14. anonymous
    • 5 years ago
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    because we didn't just add 9/4, we added 9/4 inside of parentheses multiplied by 8

  15. anonymous
    • 5 years ago
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    okay so then it would be 7y = 8 (x - 3/2)^2 - 14 ?

  16. anonymous
    • 5 years ago
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    looks good

  17. anonymous
    • 5 years ago
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    final thing is gonna be y = 8 (x - 3/2)^2 - 2

  18. anonymous
    • 5 years ago
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    don't forget to divide the 8 by 7

  19. anonymous
    • 5 years ago
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    opps my bad y = 8/7 (x - 3/2)^2 - 2 thanks so much

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