Question

evaluate the following integral

Answer 1

By Parts:

Let u = x dv = e^(-7x)
du = dx v = -(1/7) e^(-7x)

Answer 2

we can just integrate e^(-7x) just like that? we dont need any substitution?
for example e^(x^2) needs a u sub.

Answer 3

@Easyaspi314

Answer 4

marshal008...incorrect...the integral is x(e^9-7x) dx, NOT just e^(-7x)dx

Answer 5

You need "by parts" as described above.

Then use the formula : uv - integral (v du)

Answer 6

i mean for how u get the v = -(1/7) e^(-7x)