Solve the logarithmic equation for x. log(7x + 1) = 2 x =

Algebra
Tutor: None Selected Time limit: 1 Day

Solve the logarithmic equation for x.

log(7x + 1) = 2
x = 
Jul 16th, 2015

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log(7x + 1) = 2 

log(7x + 1) = log(e^2)

7x + 1 = e^2

x = (e^(2) - 1)/7

x = 0.9127

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Jul 16th, 2015

answer incorrect

Jul 16th, 2015

answer incorrect

Jul 16th, 2015

log(7x + 1) = 2 

ln(7x + 1) / ln(10) = 2 

ln(7x + 1)  = 2ln(10)

ln(7x + 1)  = ln(100)

7x + 1 = 100

7x = 99 

x = 14.1428

test it 

Jul 16th, 2015

incorrect also

Jul 16th, 2015

99/7

Jul 16th, 2015

test : 

x = 99/7 =14.1428574

Jul 16th, 2015

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Jul 16th, 2015
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Jul 16th, 2015
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