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.

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