anonymous
  • anonymous
how can I solve this problem? sqrt(2x) +4=x
Mathematics
katieb
  • katieb
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myininaya
  • myininaya
get the sqrt by itself and then square both sides
anonymous
  • anonymous
yeah, that seems the only way
anonymous
  • anonymous
and then use the root formula

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myininaya
  • myininaya
sqrt(2x)=x-4 2x=(x-4)^2 2x=x^2-8x+16 x^2-8x-2x+16=0 x^2-10x+16=0
anonymous
  • anonymous
darn, beat me to it yeah, jk about the formula
radar
  • radar
(x-8)(x-2)=0
anonymous
  • anonymous
thank you!
radar
  • radar
x=8 x=2
radar
  • radar
Check out the 2 as it may not work.
myininaya
  • myininaya
if you ever have sqrts in your problem, get rid of them by getting just one sqrt on one side of the equation and square both sides to get rid of it. the process will be continued if you have more than one
myininaya
  • myininaya
yes always check the x's that you get whenever you raise both sides to an even power which we did to get rid of the sqrt
radar
  • radar
With 2 you are using the negative root.
radar
  • radar
So I guess it is o.k, true you will lose negative sign when squaring so try and keep track.
myininaya
  • myininaya
x=2 will not work since sqrt(4) does not equal -2

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