Complicated Integral: int ( sqrt(9*x^2 - 49) ) dx

[petlover52488]

Okay, can anyone help me with this problem? It's a very complicated integral, and I REALLY need some help.

/
l (9*X^2 - 49)^(1/2) d(x)
/

Okay, that's kind of hard to read, but it's supposed to be the integral of the square root of nine ex squared minus forty-nine times d(x).

 

[stapel]

Hint: tan²(x) = sec² - 1. :wink:

Eliz.

 

[galactus]

Let \(\displaystyle \L\\x=\frac{7}{3}sec({\theta}), \;\ dx=\frac{7}{3}sec({\theta})tan({\theta})d{\theta}\)