integral(2x+1) pangkat 6 dx ? tolong bantu ya, makasih ^_^

[tex] \int\limits {(2x + 1)^{6}} \, dx [/tex]
misal u = 2x + 1
du = 2 dx
[tex] \frac{1}{2}du = dx [/tex]
[tex] \int\limits {u^{6}} \, \frac{1}{2} du \\ \frac{1}{2} \int\limits {u^{6}} \, du \\ \frac{1}{2}.\frac{1}{7}u^{7} + c \\ \frac{1}{14}(2x + 1)^{7} + c[/tex]