Q. Evaluate ∫08(8e−0.25x−6)dx and express the answer in simplest form.Answer:
Identify Integral: Identify the integral to be evaluated.We need to evaluate the integral of the function 8e−0.25x−6 with respect to x from 0 to 8.
Break Down Integral: Break down the integral into two separate integrals.The integral of a sum of functions is the sum of the integrals of each function. Therefore, we can write:∫(8e−0.25x−6)dx=∫8e−0.25xdx−∫6dx
Evaluate First Integral: Evaluate the first integral ∫8e(−0.25x)dx. To integrate 8e(−0.25x), we use the substitution method. Let u=−0.25x, then du=−0.25dx, or dx=−4du. The limits of integration also change with the substitution. When x=0, u=0, and when x=8, u=−2. The integral becomes −32∫eudu from u=0 to u=−2.
Evaluate Second Integral: Evaluate the second integral ∫6dx. The integral of a constant is the constant times the variable of integration. Therefore, ∫6dx=6x. We evaluate this from 0 to 8, which gives us 6(8)−6(0)=48.
Evaluate −32∫eudu: Evaluate the integral −32∫eudu from u=0 to u=−2. The integral of eu with respect to u is eu. Therefore, −32∫eudu=−32(eu). We evaluate this from u=0 to u=−2, which gives us −32∫eudu0.
Combine Results: Combine the results from Step 4 and Step 5.We have −32(e−2−1)+48.Now we need to calculate e−2 and simplify the expression.e−2 is approximately 0.1353.So, −32(0.1353−1)+48=−32(−0.8647)+48=27.6704+48=75.6704.
Express Answer: Express the answer in simplest form.The simplest form of the answer is a decimal rounded to an appropriate number of significant figures. Since we have already calculated the numerical value, the answer is 75.6704.
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