Q. Evaluate ∫04(3e−0.25x+8)dx and express the answer in simplest form.Answer:
Identify Function: Identify the function to integrate.We need to integrate the function f(x)=3e−0.25x+8 over the interval [0,4].
Break into Two: Break the integral into two separate integrals.The integral of a sum is the sum of the integrals, so we can write:\int(\(3e^{−0.25x} + 8)\,dx = \int 3e^{−0.25x}\,dx + \int 8\,dx
Integrate First Part: Integrate the first part ∫3e−0.25xdx. To integrate 3e−0.25x, we use the substitution method. Let u=−0.25x, then du=−0.25dx, or dx=−4du. The integral becomes −12∫eudu, which evaluates to −12eu+C. Substituting back for u, we get −12e−0.25x+C.
Integrate Second Part: Integrate the second part ∫8dx. The integral of a constant is the constant times the variable of integration, so ∫8dx=8x+C.
Combine Integrals: Combine the two integrals.The combined integral is −12e−0.25x+8x+C.
Evaluate Definite Integral: Evaluate the definite integral from 0 to 4. We need to calculate the combined integral at the upper limit x=4 and subtract the value of the combined integral at the lower limit x=0. F(4)=−12e(−0.25⋅4)+8⋅4F(0)=−12e(−0.25⋅0)+8⋅0
Calculate F Values: Calculate F(4) and F(0). F(4)=−12e−1+32 F(0)=−12e0+0 F(0) simplifies to −12+0, since e0=1.
Subtract F(0) from F(4): Subtract F(0) from F(4) to get the definite integral.∫04(3e−0.25x+8)dx=F(4)−F(0)=(−12e−1+32)−(−12)=−12e−1+32+12
Simplify Final Answer: Simplify the expression to get the final answer. −12e−1+32+12 simplifies to −e12+44.
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