Posted by **Cynthia** on Friday, August 3, 2012 at 3:17pm.

Solve tan2 x + tan x – 1 = 0 for the principal value(s) to two

decimal places.

Please Explain

- Trigonometry -
**Cynthia**, Friday, August 3, 2012 at 3:19pm
* Solve tan^2x + tanx-1=0 for the principal value(s) to two decimal places.

- Trigonometry -
**MathMate**, Friday, August 3, 2012 at 3:38pm
Let y=tan(x)

y²+y-1=0

use quadratic formula

y=(-1±√(5))/2

or

tan(x)=(-1±√(5))/2

find tan^{-1}(-1±√(5))/2 using your calculator.

## Answer this Question

## Related Questions

- trigonometry - 5. Find the complete exact solution of sin x = -√3/2. 9. ...
- trigonometry - 5.Find the complete exact solution of sin x = -√3/2. 10. ...
- trig help much appreciated! :)) - 1. Find the complete exact solution of sin x...
- Trigonometry desperate help, clueless girl here - 2. solve cos 2x-3sin x cos 2x...
- Trigonometry - Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to ...
- Trigonometry - 1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two ...
- Trigonometry - In a right triangle ABC, C = 90°, B = 38° 35' and a = 6.434 mi. ...
- math - round result to two decimal places...the answer i have is: 7.023 so two ...
- Trigonometry - Find the exact value of tan(a-b) sin a = 4/5, -3pi/2<a<-pi...
- college stats - Again sorry for all the questions. please help, I am not good at...