- #1

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## Homework Statement

Solve the Equation:

sec

^{2}A - 3tanA - 5=0, for A [tex]\in[/tex][-90,0]

## Homework Equations

## The Attempt at a Solution

[tex]\frac{1}{cos^{2}A}[/tex] - [tex]\frac{3sinA}{cosA}[/tex] -5 =0

[tex]\frac{1-3sinA.cosA}{cos^{2}A}[/tex] -5 = 0

???

Did I go wrong? If not i'm stuck. Please help. Thank you.