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goldenfox [79]
2 years ago
6

Help!! Use #8-10 to answer #11

Mathematics
1 answer:
expeople1 [14]2 years ago
7 0

Answer:

-2

Step-by-step explanation:

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Please solve the eqution<br> Cos4x + cos2x - 2 =0
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cos4x = cos2x

We know that:

cos2x = 1-2cos^2 x

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Now substitute:

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==> 2cos^2 (2x) + cos2x - 1 = 0

Now factor:

==> (2cos2x -1)(cos2x + 1) = 0

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==> x1= pi/6 , 7pi/6

==> x1= pi/6 + 2npi

==> x2= 7pi/6 + 2npi

==> cos2x = -1 ==> 2x= pi ==> x3 = pi/2 + 2npi.

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3 years ago
There are 10 less trumpet players than saxophone players. The number of saxophone playere is 3 times thr number of trumpet playe
just olya [345]
I'm guessing it 30 it says 3 times the nber of trumpet players
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2 years ago
Steve had 484848 chocolates but decided to give 888 chocolates to each of his fff coworkers.
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Look at the equation 4x - 8.4 = 2x + 5. The terms 4x and 2x are like terms
xz_007 [3.2K]

In form ax + b = c: 2x - 8.4 = 5

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Step-by-step explanation:

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