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​Find the value of x. Show work.

cos(21)=5x+27/15x

How do i solve this?????

football.girl.40  Mar 16, 2017
 #1
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Assuming that we are in degrees

 

oos(21)   = [5x + 27]/ [15x]   multiply both sides by 15x

 

(15x) cos(21)   5x + 27     subtract 5x from both sides

 

(15x) * cos(21) - 5x   = 27    factor x out of the left side

 

x * (15cos (21) - 5)  = 27      divide by   (15cos (21) - 5)

 

x  =   (27)  / (15cos (21) - 5)   ≈ 2.998 ≈  3

 

 

cool cool cool

CPhill  Mar 16, 2017

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