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anonymous

  • 5 years ago

find x such that the distance between the points is 5. (0,0),(x, -4)

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  1. anonymous
    • 5 years ago
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    i applied the distance formula, setting it equal to 5

  2. amistre64
    • 5 years ago
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    or just use a vector

  3. amistre64
    • 5 years ago
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    distance formula is the same either way

  4. amistre64
    • 5 years ago
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    x^2 + 16 = 26 x = 3 or -3

  5. amistre64
    • 5 years ago
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    and by 26 i mean 25

  6. anonymous
    • 5 years ago
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    \[\sqrt{{x^2} + 4^2} = 5\]

  7. amistre64
    • 5 years ago
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    right; now square both sides; or simply forgo that steps by doing it in your mind :)

  8. anonymous
    • 5 years ago
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    right so we get: x = +-3

  9. anonymous
    • 5 years ago
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    I thought if i applied the distance formula again with x = 3, i should get 5

  10. amistre64
    • 5 years ago
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    you will

  11. amistre64
    • 5 years ago
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    9+16 = 5^2 25 = 25

  12. anonymous
    • 5 years ago
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    right i see, thank you!

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