Solve the logarithmic equation for x. (Round your answer to four decimal places.

Algebra
Tutor: None Selected Time limit: 1 Day

Solve the logarithmic equation for x. (Round your answer to four decimal places.)
ln(x − 1) + ln(x + 2) = 1

x = 

Apr 17th, 2015

ln (x-1)(x+2) = 1;

(x-1)(x+2) = e;

x^2 + x - 2 - e = 0;

x_1 =( -1 + sqrt{1 + 8 + 4e})/2 = (-1 +sqrt{9 + 4e})/2 = 1.7290 and 

x_2 =( -1 - sqrt{1 + 8 + 4e})/2 = (-1 -sqrt{9 + 4e})/2 = -2.7290 (the second root is < -2 and is not valid).

Answer: x = 1.7290

Apr 17th, 2015

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