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

  2. OpenSessame
    • 2 years 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
    • 2 years ago
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    pok

  4. superloz
    • 2 years ago
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    ok

  5. superloz
    • 2 years ago
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    then

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

  7. OpenSessame
    • 2 years ago
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    so (x+4)(x+4)

  8. superloz
    • 2 years ago
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    simplify?

  9. OpenSessame
    • 2 years 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
    • 2 years ago
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    (2x-3)(2x-3)+(x+4)(x+4)=20

  11. OpenSessame
    • 2 years ago
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    You have to solve for x before moving on

  12. superloz
    • 2 years ago
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    is the answer 7?

  13. OpenSessame
    • 2 years ago
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    Uh one sec still solving!

  14. OpenSessame
    • 2 years ago
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    Plug it in to check!

  15. OpenSessame
    • 2 years ago
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    I dont think thats it?

  16. superloz
    • 2 years ago
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    idk

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

  18. OpenSessame
    • 2 years ago
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    You have to do the quadratic eqaution...

  19. superloz
    • 2 years ago
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    idk how to do quad

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

  21. superloz
    • 2 years ago
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    yep

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

  23. superloz
    • 2 years ago
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    ok

  24. OpenSessame
    • 2 years ago
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    Its an imaginary number...

  25. OpenSessame
    • 2 years 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
    • 2 years ago
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    Figured out the better way to solve it lol

  27. superloz
    • 2 years ago
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    thank you

  28. OpenSessame
    • 2 years ago
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    DO you understand how i got there?

  29. superloz
    • 2 years ago
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    so BE is half and BD is the other half?

  30. superloz
    • 2 years ago
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    each is 3?

  31. OpenSessame
    • 2 years 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
    • 2 years 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
    • 2 years ago
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    thanks

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