Q. Evaluate ∫11e2+10x−104x−43dx. Write your answer in simplest form with all logs condensed into a single logarithm (if necessary).
Simplify Integrand: Simplify the integrand if possible.The integrand (4x−43)/(x−10) can be simplified by long division since the degree of the numerator is equal to the degree of the denominator. We divide 4x by x to get 4 and multiply (x−10) by 4 to get 4x−40. We subtract this from the numerator to get a remainder of −3. So, the integrand simplifies to 4−3/(x−10).
Split Integral: Split the integral into two separate integrals.The integral of the sum is the sum of the integrals, so we can write:∫x−104x−43dx=∫4dx−∫x−1043dx
Integrate Terms: Integrate each term separately.The integral of a constant is just the constant times the variable, so:∫4dx=4xThe integral of (x−10)3 is 3 times the natural logarithm of the absolute value of (x−10), so:∫(x−10)3dx=3ln∣x−10∣
Combine Integrals: Combine the two integrals.The combined integral is:∫x−104x−43dx=4x−3ln∣x−10∣
Evaluate Definite Integral: Evaluate the definite integral from 11 to e2+10. We substitute the upper and lower limits into the antiderivative: (4(e2+10)−3ln∣e2+10−10∣)−(4(11)−3ln∣11−10∣)
Simplify Expression: Simplify the expression.We simplify the expression by performing the arithmetic:= (4e2+40−3ln∣e2∣)−(44−3ln∣1∣)Since ln∣e2∣=2 (because elnx=x for any x) and ln∣1∣=0 (because e0=1), we get:= (4e2+40−3×2)−(44−3×0)= (4e2+40−6)−(44)= 4e2+34−44= 4e2−10
Write Final Answer: Write the final answer.The final answer is the simplified form of the definite integral from 11 to e2+10 of the function (4x−43)/(x−10).
More problems from Evaluate definite integrals using the chain rule