Question

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

Please Explain

Answer 1

* Solve tan^2x + tanx-1=0 for the principal value(s) to two decimal places.

Answer 2

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.