Janu16
  • Janu16
Given the equation Square root of 8x plus 1 = 5, solve for x and identify if it is an extraneous solution.
Mathematics
jamiebookeater
  • jamiebookeater
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Janu16
  • Janu16
|dw:1438822086628:dw| so i checked my answer and i got 2 but thats not one of my answer choice
Janu16
  • Janu16
DanJS
  • DanJS
hi

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DanJS
  • DanJS
if that 1 is under the root , you cant just subtract it
DanJS
  • DanJS
square both sides first 8x + 1 = 25
Janu16
  • Janu16
how did you get 25
DanJS
  • DanJS
squared both sides first, removes the root, and 5^2 = 25
Janu16
  • Janu16
oh so you solve the whole thing
DanJS
  • DanJS
you subtracted a 1 out from underneath the root sign, that is illegal
Janu16
  • Janu16
ohok lol
Janu16
  • Janu16
so you get 3
DanJS
  • DanJS
\[[\sqrt{8x+1}]^2=5^2\]
DanJS
  • DanJS
yeah 3
Janu16
  • Janu16
thx
DanJS
  • DanJS
np

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