allaboutcleans allaboutcleans
  • 03-11-2020
  • Mathematics
contestada

When the sum of 7 and twice a positive number is subtracted from the square of the​ number, 0 results. find the number?

Respuesta :

mysticsouls
mysticsouls mysticsouls
  • 03-11-2020

Answer:

x^2 - 2x - 7 = 0

Step-by-step explanation:

??? Maybe I am not sure

Answer Link
gardnerdanj gardnerdanj
  • 03-11-2020

Answer:

x = 3.82 or x=-1.82

Step-by-step explanation:

[tex]x^{2} -(2x+7) = 0\\x^{2} -2x-7=0\\[/tex]

The solution is:

[tex]x=\frac{2+\sqrt{2^{2}+4*7 } }{2}[/tex]

or

[tex]x=\frac{2-\sqrt{2^{2}+4*7 } }{2}[/tex]

So x = 3.82 or x=-1.82

Answer Link

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