1meghannpeterson
1meghannpeterson 1meghannpeterson
  • 16-11-2017
  • Mathematics
contestada

Does anyone know this and if it is extraneous or not?

Does anyone know this and if it is extraneous or not class=

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apologiabiology
apologiabiology apologiabiology
  • 16-11-2017
addd 4 to both sides
[tex]\sqrt{x+9}=5[/tex]
sqare both sides
x+9=25
minus 9 both sides
x=16

plug it in for x and see
[tex]\sqrt{16+9}-4=1[/tex]
[tex]\sqrt{25}-4=1[/tex]
[tex]5-4=1[/tex]
1=1
true

not extraneous
an extraneous root would be x=-34
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