Answered

Solve the given equation over the interval [0, 2.2): 2 cos2 x + cos x + 15 = 0.X = 0 and x = 2.0T57x= - and x=66There are no real valued solutions for the equation.T371x= and x =2

Answer :

The given function is

[tex]2\cos ^2x+\cos x+15=0[/tex]

Solve the equation to get:

[tex]\cos x=\frac{-1\pm\sqrt[]{1-4\ast2\ast15}}{4}=\frac{-1\pm\sqrt[]{-119}}{4}[/tex]

The square root of a negative number is not real hence there are no real valued solutions

Option C is correct.

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