How do you solve the equation $2cos^2x- 7cosx + 3 = 0$ ?

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Answer 1 · 2016-08-30T17:53:22

$x = pi/3 + 2pin and x = (5pi)/3 + 2pin$

Solve by factoring.

$2cos^2x - 6cosx - cosx + 3 =0$

$2cosx(cosx - 3) - 1(cosx - 3) = 0$

$(2cosx -1)(cosx - 3) = 0$

$cosx= 1/2 and cosx = 3$

$x = pi/3 + 2pin, x = (5pi)/3 + 2pin$

Hopefully this helps!

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