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grayp

  • 3 years ago

Geometry side-spliting Theorem.

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  1. grayp
    • 3 years ago
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    |dw:1358229934642:dw|

  2. grayp
    • 3 years ago
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    Use the side-spliting theorem to find x.

  3. grayp
    • 3 years ago
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    |dw:1358230905589:dw|

  4. grayp
    • 3 years ago
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    the bottom one is messy by ? and 6 equals 15

  5. mathstudent55
    • 3 years ago
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    When you draw a segment parallel to one side of a trianlge, it splits the other sides into proportional segements. |dw:1358231159770:dw|

  6. grayp
    • 3 years ago
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    Yeah I did that but my whats the correct answer for x? I foiled the numbers then tried to factor but that didn't work.

  7. mathstudent55
    • 3 years ago
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    Cross multiply, then FOIL on both sides. (x - 1)(x - 2) = (x + 1)(x - 3)

  8. grayp
    • 3 years ago
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    thanks I'll try that again

  9. mathstudent55
    • 3 years ago
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    x^2 - 3x + 2 = x^2 - 2x - 3

  10. mathstudent55
    • 3 years ago
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    Tell me if you get the above.

  11. grayp
    • 3 years ago
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    thats what i got but then x would have to be x^2 - x + 5 = x^2 that would have to be the answer.

  12. mathstudent55
    • 3 years ago
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    Good. Now subtract x^2 from both sides.

  13. grayp
    • 3 years ago
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    0= -x + 5 then add x to the other side x= 5

  14. mathstudent55
    • 3 years ago
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    x^2 - 3x + 2 = x^2 - 2x - 3 - x^2 -x^2 ---------------------------- -3x + 2 = -2x - 3 + 2x -2 +2x - 2 ---------------------------- -x = -5 x = 5

  15. mathstudent55
    • 3 years ago
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    That's it. You got it.

  16. grayp
    • 3 years ago
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    I appreciate all the help, I just didn't know I could subtract 2x. thanks very much.

  17. mathstudent55
    • 3 years ago
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    You're welcome.

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