anonymous
  • anonymous
x^2 + 4=104 what is x? There will be a positive and negative number.
Pre-Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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John_ES
  • John_ES
\[x^2=104-4=100\Rightarrow x^2=100\Rightarrow x=\pm\sqrt{100}=\pm10\]
anonymous
  • anonymous
I am so confused
Directrix
  • Directrix
x^2 + 4=104 Subtract 4 from both sides. x^2 = 100 What number times itself is equal to 100? @Kaila_111697

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Directrix
  • Directrix
Post what you think it is.
anonymous
  • anonymous
10
Directrix
  • Directrix
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.
Directrix
  • Directrix
@Kaila_111697 That is correct. What about the negative number.
anonymous
  • anonymous
But it is not 100 its 104
anonymous
  • anonymous
x^2+4=104 x^2=104-4=100 x=sqrt100=\[\pm10\]
Directrix
  • Directrix
@Kaila_111697 Look at the equation: x^2 + 4=104 We subtracted the 4 from both sides to get x^2 = 100.
anonymous
  • anonymous
oh so 10 and -10
Directrix
  • Directrix
But 10 satisfies the equation: x^2 + 4=104 because 10*10 + 4 = 100 +4.
Directrix
  • Directrix
>>oh so 10 and -10 Yes.
anonymous
  • anonymous
Thank you so much
Directrix
  • Directrix
Glad to help.

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