Q. Evaluate ∫37x+14x2−5x−12dx. Write your answer in simplest form with all logs condensed into a single logarithm (if necessary).
Perform polynomial long division: Perform polynomial long division to simplify the integrand.We need to divide the polynomial 4x2−5x−12 by x+1.
Polynomial long division calculation: Polynomial long division calculation.(4x2−5x−12)÷(x+1)=4x−9−(x+1)3Now we can rewrite the integral as:∫37(4x−9−(x+1)3)dx
Split into three integrals: Split the integral into three separate integrals.\int_{\(3\)}^{\(7\)} (\(4x - 9 - \frac{3}{x + 1}) \, dx = \int_{3}^{7} 4x \, dx - \int_{3}^{7} 9 \, dx - \int_{3}^{7} \frac{3}{x + 1} \, dx
Evaluate each integral separately: Evaluate each integral separately.First integral: ∫374xdx=2x2 | from x=3 to x=7Second integral: ∫379dx=9x | from x=3 to x=7Third integral: ∫37x+13dx=3ln∣x+1∣ | from x=3 to x=7
Calculate definite integrals: Calculate the definite integrals using the Fundamental Theorem of Calculus.First integral: 2x2∣ from x=3 to x=7=2(72)−2(32)=98−18=80Second integral: 9x∣ from x=3 to x=7=9(7)−9(3)=63−27=36Third integral: 3ln∣x+1∣∣ from x=3 to x=7=3ln(7+1)−3ln(3+1)=3ln(8)−3ln(4)
Combine integral results: Combine the results from each integral.Total integral value = 80−36−(3ln(8)−3ln(4))
Simplify the expression: Simplify the expression.Total integral value = 44−3ln(8)+3ln(4)Since ln(a)−ln(b)=ln(ba), we can combine the logarithms:Total integral value = 44−3ln(23/22)=44−3ln(2)
Write final answer: Write the final answer.The integral of (4x2−5x−12)/(x+1) from x=3 to x=7 is 44−3ln(2).
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