Q. Evaluate ∫04(9e0.25x+4x)dx and express the answer in simplest form.Answer:
Identify Integral: Identify the integral to be solved.We need to evaluate the integral of the function 9e0.25x+4x with respect to x from 0 to 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:∫(9e0.25x+4x)dx=∫9e0.25xdx+∫4xdx
Evaluate First Integral: Evaluate the first integral ∫9e(0.25x)dx. To integrate 9e(0.25x), we can use the substitution method: Let u=0.25x, then du=0.25dx, or dx=4du. The integral becomes: ∫9e(u)⋅4du=36∫e(u)du The integral of e(u) is e(u), so we have: 36∫e(u)du=36e(u)+C Substituting back for u, we get: 9e(0.25x)0
Evaluate Second Integral: Evaluate the second integral ∫4xdx. The integral of 4x with respect to x is 2x2, so we have: ∫4xdx=2x2+C
Combine Results: Combine the results of the two integrals.The combined indefinite integral is:36e0.25x+2x2+C
Evaluate Definite Integral: Evaluate the definite integral from 0 to 4. We need to calculate the value of the combined integral at the upper limit (x=4) and subtract the value at the lower limit (x=0). For x=4: 36e(0.25⋅4)+2⋅42=36e1+2⋅16=36e+32 For x=0: 36e(0.25⋅0)+2⋅02=36e0+0=36 Now subtract the value at x=0 from the value at x=4: 40
Write Final Answer: Write the final answer.The value of the definite integral from 0 to 4 is 36e−4.
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