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Help.

NotSoSmart  Jan 3, 2018
 #1
avatar+88871 
+1

21.   Rearrange as

 

x^4 + 27x^2 - 324  =  0       factor as

 

(x^2  -  9)  ( x^2  + 36)  = 0

 

(x + 3) ( x - 3)  ( x + 6i) (x - 6i)  = 0

 

Set each factor to 0 and solve for x and we get the solutions  x = -3, 3, - 6i, 6i

 

 

22.  ( s +  3v)^5   =

 

s^5   +  5*s^4*(3v)  + 10*s^3*(3v)^2  +  10*s^2*(3v)^3  + 5*s*(3v)^4  + (3v)^5  =

 

s^5  + 15s^4v + 90s^3v^2  + 270s^2v^3 + 405sv^4  + 243v^5

 

 

cool cool cool

CPhill  Jan 3, 2018

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