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ratelena [41]
2 years ago
9

Find all solutions to the equation. cos^2 x +2cosx+1=0

Mathematics
1 answer:
Schach [20]2 years ago
4 0

x= \pi

Step-by-step explanation:

\cos^2x+\cos x+1=0

Let u= \cos x

Then u^2+2u+1=(u+1)^2=0

or

\cos x = -1

This gives us x= \pi or all integer multiples of \pi (n \pi)

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A graph of a quadratic function y = f(x) is shown below.
spin [16.1K]

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8 0
3 years ago
Read 2 more answers
Need help with this.
Ber [7]
Slope is -1
Y intercept 3
X Intercept 4
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Haven’t gone over that

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Answer:

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Step-by-step explanation:

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3 years ago
Table:
sineoko [7]

Answer:

exponential

Step-by-step explanation:

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+7

+10

+15

+21

+30

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