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solve 2 log7(1-2x)=12

0 votes

please help. also check for extraneous solutions.

asked Feb 18, 2014 in ALGEBRA 2 by angel12 Scholar

1 Answer

0 votes

The logarithmic equation is .

Divide each side by 2.

Apply exponential formula: .

Subtract 1 from each side.

Divide each side by negative 2.

image.

Check:-

To check the solution, substitute the value of image in original equation.

image

Divide each side by 2.

image

image

image

Apply exponential formula: .

image

image

The statement is true, so the value of image in the solution of original equation.

answered Mar 22, 2014 by goushi Pupil
edited Mar 22, 2014 by goushi

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