trig problem

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

andyjl

Full Member
10+ Year Member
5+ Year Member
15+ Year Member
Joined
Apr 16, 2007
Messages
168
Reaction score
0
This problem comes from kaplan book pg 108.
If x is an acute angle for which tan^2(x) = 6tan(x) - 9, what is the measure of x?

So this is the quadratic equation and it comes ot to be tanx = 3.
x = arctan(3) and the answer comes out to approximately 71.6. How am I suppose to possibly know what the inverse tan is suppose to be to solve this?

Members don't see this ad.
 
Top