anonymous
  • anonymous
solve 7.2x ― 65 = 0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
7.2x=65 x=65/7.2=9.028
anonymous
  • anonymous
Hmm the problem that i had with this question is that the x is in the powers position in teh question (Attached file) ...does it mean teh same thing?
1 Attachment
anonymous
  • anonymous
sorry in question it doesn't look that like..

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anonymous
  • anonymous
ik thats why i posted pic
anonymous
  • anonymous
\[xln7.2=\ln65\] now please find the values
anonymous
  • anonymous
\[xln7.2=\ln65\] now please find the values
anonymous
  • anonymous
x = 2.11....? i just ln both #'s in cal...and divided the two to solve for x....ik its wrong but idk how to do this..
anonymous
  • anonymous
do u know the use of ln???
anonymous
  • anonymous
hmm no...
anonymous
  • anonymous
please go through the page http://en.wikipedia.org/wiki/Logarithm
anonymous
  • anonymous
Your problem looms like this..\[7.2^{x} -65=0\] Hence \[7.2^{x}=56\] So take the log of both sides of the equation using your calculator (this will automatically be to base 10) \[\log_{10}7.2^{x} =\log_{10} 65\] Then because of the laws of logorithms you can bring the power down to become the coefficient of the first term \[x \log_{10} 7.2=\log_{10} 56\] Then divide the right by the left leaving x on the left hand side; \[x=\log_{10}56/\log_{10} 7.2\] which equals 2.1146(4.D.P) you can check it equals x by raising 7 to this number - it gives 65.

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