# Math Help - Trig substitution

1. ## Trig substitution

what should I substitute here?

2. It might become more obvious if you complete the square in the denominator first...

3. Originally Posted by pickslides
It might become more obvious if you complete the square in the denominator first...
if your saying that I use tan substitution then that's not working out....i am at a loss here.. i have an exam and i have been trying to solve this fr some time.....can u explain if u know d answer....

4. Try making $x+5 = 5\sec\theta \implies dx = 5\sec\theta \tan\theta$

5. Originally Posted by pickslides
Try making $x+5 = 5\sec\theta \implies dx = 5\sec\theta \tan\theta$
nope....thts not working either....thnx newayz

6. Originally Posted by pickslides
Try making $x+5 = 5\sec\theta \implies dx = 5\sec\theta \tan\theta$
thnx tht did work out!