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(2x+6)5dx\int(2x+6)^5\,dx

Full solution

Q. (2x+6)5dx\int(2x+6)^5\,dx
  1. Recognize the integral: Recognize the integral to be solved.\newlineWe need to find the integral of (2x+6)5(2x+6)^5 with respect to xx.
  2. Apply power rule: Apply the power rule for integration.\newlineThe power rule for integration states that the integral of xnx^n with respect to xx is (x(n+1))/(n+1)+C(x^{(n+1)})/(n+1) + C, where CC is the constant of integration. However, since we have a linear term (2x+6)(2x+6) instead of just xx, we need to adjust the rule accordingly.
  3. Use substitution: Use substitution to simplify the integral.\newlineLet u=2x+6u = 2x + 6, then du=2dxdu = 2dx. This means that dx=du2dx = \frac{du}{2}.
  4. Rewrite in terms of uu: Rewrite the integral in terms of uu. The integral becomes 12×u5du\frac{1}{2} \times \int u^5 \, du, since we have to divide by 22 to account for the substitution of dxdx.
  5. Apply power rule for u: Apply the power rule for integration to the integral in terms of uu. Using the power rule, we get (12)×(u66)+C(\frac{1}{2}) \times (\frac{u^6}{6}) + C.
  6. Substitute back xx: Substitute back the original variable xx into the integral.\newlineReplace uu with 2x+62x + 6 to get (1/2)×((2x+6)6/6)+C(1/2) \times ((2x + 6)^{6}/6) + C.
  7. Simplify expression: Simplify the expression.\newlineWe can simplify the expression to (112)×(2x+6)6+C(\frac{1}{12}) \times (2x + 6)^6 + C.