Annetta_Martin
Help with Logarithms?



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Annetta_Martin
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Best_Mathematician
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dw:1365375002492:dw

Annetta_Martin
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For #4 this is how I did it....

Annetta_Martin
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(x  2) log(7) = x * log(5)
x * log(7)  x * log(5) = 2 log(7)
x [log(7)  log(5)] = 2 log(7)
x [log(7)  log(5)] = 2 log(7)
x = 2 log(7) / [log(7)  log(5)] = log(49) / log(7/5) ≈ 11.57

Annetta_Martin
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#2 *

HawkCrimson
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looks gud :)

Annetta_Martin
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For #1 this is how I have done it so far...

Annetta_Martin
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16^x4 = 3^3x
(x4)log16 = (3x)log3
xlog16  4log16 = 3log3  xlog3
xlog16 + x log3 = 3log3 + 4log16
x = (3log3 + 4log16) / (log16 + log3)

HawkCrimson
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wats the problem?

HawkCrimson
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it looks fine too :)

Annetta_Martin
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I don't know how to finish it though... :(

Annetta_Martin
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I feel like I got stuck and I don't know where to go from there.

HawkCrimson
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cannt u type it all into ur calculator now and solve?

Annetta_Martin
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I don't have those types of calculators, it was my teacher that tried helping me out with the first one.

HawkCrimson
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u need a calculator to do logs..

HawkCrimson
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i have one though and i can tell u wat the answer is :)

HawkCrimson
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x = (3log3 + 4log16) / (log16 + log3)
x = 3.72