Math  /  Calculus

QuestionFind 1e26xdx\int_{1}^{e^{2}} \frac{6}{x} d x

Studdy Solution

STEP 1

1. We are asked to evaluate the definite integral 1e26xdx\int_{1}^{e^{2}} \frac{6}{x} \, dx.
2. The function 6x\frac{6}{x} is continuous and integrable over the interval [1,e2][1, e^2].

STEP 2

1. Identify the antiderivative of the integrand 6x\frac{6}{x}.
2. Evaluate the definite integral using the Fundamental Theorem of Calculus.

STEP 3

Identify the antiderivative of 6x\frac{6}{x}:
The antiderivative of 1x\frac{1}{x} is lnx\ln |x|. Therefore, the antiderivative of 6x\frac{6}{x} is:
6xdx=6lnx+C \int \frac{6}{x} \, dx = 6 \ln |x| + C
where CC is the constant of integration.

STEP 4

Apply the Fundamental Theorem of Calculus to evaluate the definite integral:
1e26xdx=[6lnx]1e2 \int_{1}^{e^{2}} \frac{6}{x} \, dx = \left[ 6 \ln |x| \right]_{1}^{e^{2}}

STEP 5

Evaluate the expression at the upper limit e2e^2:
6lne2=6ln(e2)=62lne=121=12 6 \ln |e^2| = 6 \ln (e^2) = 6 \cdot 2 \ln e = 12 \cdot 1 = 12

STEP 6

Evaluate the expression at the lower limit 11:
6ln1=6ln(1)=60=0 6 \ln |1| = 6 \ln (1) = 6 \cdot 0 = 0

STEP 7

Subtract the evaluated lower limit from the evaluated upper limit:
1e26xdx=120=12 \int_{1}^{e^{2}} \frac{6}{x} \, dx = 12 - 0 = 12
The value of the definite integral is:
12 \boxed{12}

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