Question

solve 7.2x ― 65 = 0

Answer 1

7.2x=65
x=65/7.2=9.028

Answer 2

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?

Answer 3

sorry in question it doesn't look that like..

Answer 4

ik thats why i posted pic

Answer 5

\[xln7.2=\ln65\] now please find the values

Answer 6

\[xln7.2=\ln65\] now please find the values

Answer 7

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..

Answer 8

do u know the use of ln???

Answer 9

hmm no...

Answer 10

please go through the page http://en.wikipedia.org/wiki/Logarithm

Answer 11

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.