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Kaila_111697

  • 3 years ago

x^2 + 4=104 what is x? There will be a positive and negative number.

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  1. John_ES
    • 3 years ago
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    \[x^2=104-4=100\Rightarrow x^2=100\Rightarrow x=\pm\sqrt{100}=\pm10\]

  2. Kaila_111697
    • 3 years ago
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    I am so confused

  3. Directrix
    • 3 years ago
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    x^2 + 4=104 Subtract 4 from both sides. x^2 = 100 What number times itself is equal to 100? @Kaila_111697

  4. Directrix
    • 3 years ago
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    Post what you think it is.

  5. Kaila_111697
    • 3 years ago
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    10

  6. Directrix
    • 3 years ago
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    If I had asked what number times itself equals 25, you would have said 5 because 5 times 5 equals 25. Then, I would have said but there is also a negative number that you can multiply times itself and get 25. You would have said -5 because -5 times -5 = 25.

  7. Directrix
    • 3 years ago
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    @Kaila_111697 That is correct. What about the negative number.

  8. Kaila_111697
    • 3 years ago
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    But it is not 100 its 104

  9. surjithayer
    • 3 years ago
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    x^2+4=104 x^2=104-4=100 x=sqrt100=\[\pm10\]

  10. Directrix
    • 3 years ago
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    @Kaila_111697 Look at the equation: x^2 + 4=104 We subtracted the 4 from both sides to get x^2 = 100.

  11. Kaila_111697
    • 3 years ago
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    oh so 10 and -10

  12. Directrix
    • 3 years ago
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    But 10 satisfies the equation: x^2 + 4=104 because 10*10 + 4 = 100 +4.

  13. Directrix
    • 3 years ago
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    >>oh so 10 and -10 Yes.

  14. Kaila_111697
    • 3 years ago
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    Thank you so much

  15. Directrix
    • 3 years ago
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    Glad to help.

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