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  1. superloz
    • one year ago
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    how to find the second one?

  2. OpenSessame
    • one year ago
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    The diagonals are in the middle of the triangle so its basically it is breaking it up in 4 equal peices.

  3. superloz
    • one year ago
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    pok

  4. superloz
    • one year ago
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    ok

  5. superloz
    • one year ago
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    then

  6. OpenSessame
    • one year ago
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    So if you are trying to find ac it would what half of it twice.

  7. OpenSessame
    • one year ago
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    so (x+4)(x+4)

  8. superloz
    • one year ago
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    simplify?

  9. OpenSessame
    • one year ago
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    Since you have the sum of the length of the diaganols you have to make an equation equal to 20.

  10. OpenSessame
    • one year ago
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    (2x-3)(2x-3)+(x+4)(x+4)=20

  11. OpenSessame
    • one year ago
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    You have to solve for x before moving on

  12. superloz
    • one year ago
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    is the answer 7?

  13. OpenSessame
    • one year ago
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    Uh one sec still solving!

  14. OpenSessame
    • one year ago
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    Plug it in to check!

  15. OpenSessame
    • one year ago
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    I dont think thats it?

  16. superloz
    • one year ago
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    idk

  17. superloz
    • one year ago
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    i solve this for x (2x-3)(2x-3)+(x+4)(x+4)=20

  18. OpenSessame
    • one year ago
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    You have to do the quadratic eqaution...

  19. superloz
    • one year ago
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    idk how to do quad

  20. OpenSessame
    • one year ago
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    did you get 5x^2-4x+25=20 when you simplified?

  21. superloz
    • one year ago
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    yep

  22. OpenSessame
    • one year ago
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    Okay you need quad to find x give me a minute and ill do it...

  23. superloz
    • one year ago
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    ok

  24. OpenSessame
    • one year ago
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    Its an imaginary number...

  25. OpenSessame
    • one year ago
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    Assuming the rhombus is ABCD and E is the intersection of the diagonals, then we know the diagonals perpendicularly bisect each other, so AE is half of one diagonal and BE is half the other diagonal. That allows us to solve for x: (x+4) + (2x-3) = 20/2 3x + 1 = 10 3x = 9 x = 3 and since BE = 2x - 3 = 3 is half of BD, BD = 2*3 = 6 (answer C).

  26. OpenSessame
    • one year ago
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    Figured out the better way to solve it lol

  27. superloz
    • one year ago
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    thank you

  28. OpenSessame
    • one year ago
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    DO you understand how i got there?

  29. superloz
    • one year ago
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    so BE is half and BD is the other half?

  30. superloz
    • one year ago
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    each is 3?

  31. OpenSessame
    • one year ago
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    Wait!!! i messed up lol you plug the three in x+4 and multiply it by 2 because you are finding ac

  32. OpenSessame
    • one year ago
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    For some reason i thought it was the other one. But it will be 14 in that case.

  33. superloz
    • one year ago
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    thanks

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