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Evaluate the integral.

int-2xe^(x+5)dx
Answer:

Evaluate the integral.\newline2xex+5dx \int-2 x e^{x+5} d x \newlineAnswer:

Full solution

Q. Evaluate the integral.\newline2xex+5dx \int-2 x e^{x+5} d x \newlineAnswer:
  1. Identify Integral: Let's start by identifying the integral we need to evaluate:\newlineI=2xe(x+5)dxI = \int -2xe^{(x+5)}\,dx\newlineThis is an integration problem that can be solved using integration by parts, which is based on the formula udv=uvvdu\int u\,dv = uv - \int v\,du, where uu and dvdv are parts of the integrand chosen such that dudu and vv can be easily computed.
  2. Choose uu and dvdv: Choose uu and dvdv for the integration by parts. Let's let u=2xu = -2x, which means du=2dxdu = -2dx. Let dv=e(x+5)dxdv = e^{(x+5)}dx, which means vv is the antiderivative of e(x+5)e^{(x+5)}, which is e(x+5)e^{(x+5)} itself since the derivative of e(x+5)e^{(x+5)} is e(x+5)e^{(x+5)}.
  3. Apply Integration by Parts: Now we apply the integration by parts formula:\newline2xe(x+5)dx=uvvdu\int -2xe^{(x+5)}\,dx = uv - \int v\,du\newline= (2x)e(x+5)(-2x)e^{(x+5)} - e(x+5)(2dx)\int e^{(x+5)}(-2\,dx)
  4. Simplify Integral: Simplify the integral:\newline=2xe(x+5)+2e(x+5)dx= -2xe^{(x+5)} + 2\int e^{(x+5)}dx\newlineNow we need to integrate e(x+5)e^{(x+5)} with respect to xx, which is straightforward since the integral of e(x+5)e^{(x+5)} is e(x+5)e^{(x+5)}.
  5. Perform Integration: Perform the integration:\newline2e(x+5)dx=2e(x+5)2\int e^{(x+5)}dx = 2e^{(x+5)}\newlineSo the integral becomes:\newline2xe(x+5)+2e(x+5)-2xe^{(x+5)} + 2e^{(x+5)}
  6. Combine Terms: Combine the terms to get the final answer:\newlineI=2xe(x+5)+2e(x+5)+CI = -2xe^{(x+5)} + 2e^{(x+5)} + C\newlinewhere CC is the constant of integration.