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xxcrashhardd

  • 4 years ago

solve the radical equation √18x-9=x+4

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  1. 101Ryan101
    • 4 years ago
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    there are a few possible first steps.. what do you think?

  2. xxcrashhardd
    • 4 years ago
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    square it.

  3. 101Ryan101
    • 4 years ago
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    yea, then it's: 18x-9 = x^2 +8x +16 now what?

  4. xxcrashhardd
    • 4 years ago
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    add 9

  5. 101Ryan101
    • 4 years ago
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    ok, then it's: 18x = x^2 +8x +25 now what?

  6. xxcrashhardd
    • 4 years ago
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    subtract 8x?

  7. xxcrashhardd
    • 4 years ago
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    how is it 0?

  8. 101Ryan101
    • 4 years ago
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    opps. lol

  9. 101Ryan101
    • 4 years ago
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    lets subtrack 18x... then it's x^2 -10x + 25

  10. 101Ryan101
    • 4 years ago
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    =0

  11. xxcrashhardd
    • 4 years ago
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    Okay, now factor it ?

  12. 101Ryan101
    • 4 years ago
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    totally

  13. 101Ryan101
    • 4 years ago
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    (x-5)(x-5)

  14. xxcrashhardd
    • 4 years ago
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    so my answers 5?

  15. 101Ryan101
    • 4 years ago
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    so x = 5

  16. 101Ryan101
    • 4 years ago
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    idneeeeed.

  17. xxcrashhardd
    • 4 years ago
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    thank you!

  18. 101Ryan101
    • 4 years ago
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    sure!

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