Question

Stuck yet again... trig integral substitution completing the square. I only need to say what needs to be substituted for x, so it doesn't need to be solved.

Answer 1

the computer says that my answer is wrong :/ It wants x=f(theta)

Answer 2

do you have link to computer

Answer 3

well... I can't really post a link, but I took a screen shot...

Answer 4

still want help?>

Answer 5

yes please :/. If you can, I would be very grateful :p

Answer 6

so I got integral sqrt(5) *x sqrt ( (x+3)^2 - 3/5 )

Answer 7

we want integral sqrt( u^2 - a^2) , substitution u = a sec theta

Answer 8

so you have the option of first doing u substitution

Answer 9

or you can do x + 3 = sqrt(3/5) sec theta

Answer 10

Thank you perl. You are a lifesaver :)