Question

integrate by substitution... x^3(6+5x^4)^7 .. my u=?

Answer 1

u= (6+5x^4)?

Answer 2

yup

Answer 3

du= 20x^3?

Answer 4

yup again.

Answer 5

what about that 7th power?

Answer 6

If you sub back in u and du your equation becomes

Answer 7

u^7

Answer 8

yay! I know what im doing! thanks guys! sketch gets the best, tho.....

Answer 9

g(u)= u^7?

Answer 10

leads to-> 1/20*u^8/8 +c?

Answer 11

Yes but you can't leave u in your answer so substitute back in.