anonymous
  • anonymous
Review: Solving Logarithmic Functions Question below.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Help me solve this please. \(\sf \sqrt{ln(e^2x)+12}-2=e^{ln x}\) I know that \(\sf ln e^(2x)=2x\) and \(\sf e^{ln x}=x\) So \(\sf \sqrt{2x+12} -2=x \\ \sqrt{2x+12}=x+2\) then I square on both sides to get rid off the radical: \(\sf 2x+12=(x+2)^2 \\ 2x+12=x^2+4x+4\\ 0=x^2+4x-2x+4-12 \\ 0=x^2+2x-8 \\ (x+4)(x-2) \) so x=-4 and x=2.. but how come the correct answer is only x=2? Did I do something wrong?
anonymous
  • anonymous
causes you can't take the of a negative number
anonymous
  • anonymous
oops should be \(\sf ln\ e^{2x}\) oh yeah i got it lol thanks

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anonymous
  • anonymous
i tried it once, had a headache for three diays
anonymous
  • anonymous
yw

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