Mathematics: Solve equation by using the quadratic formula. 25x^2 + 60x = -36

The third exterior angle is Step-by-step explanation:GivenRequiredThe third exterior angle The exterior angles of a triangle add up to 360 degrees.So:Make the subjectSubstitute known values...

Solve equation by using the quadratic formula.

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Svetakotok

02.11.2021

Mathematics

The third exterior angle is 103^o

Step-by-step explanation:

Given

$\theta = 158^o$

$\alpha = 99^o$

Required

The third exterior angle $(\beta)$

The exterior angles of a triangle add up to 360 degrees.

So:

$\theta + \alpha + \beta = 360^o$

Make $\beta$ the subject

$\beta = 360^o - (\theta + \alpha)$

Substitute known values

$\beta = 360^o - (158^o + 99^o)$

$\beta = 103^o$

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Solve equation by using the quadratic formula.
25x^2 + 60x = -36

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