+0  
 
+2
174
4
avatar+80 

show the steps of hw to factor

x^3+5

gadzooks1753  Nov 28, 2017
 #1
avatar+87294 
+2

Using

 

a^3  +  b^3   =   (a  + b) (a^2  - ab + b^2)   ...   we have...

 

 

x^3   +   5    =

 

( x  +  ∛ 5  )   (  x^2    -  x ∛ 5   +   [∛ 5 ]^2  )

 

 

cool cool cool

CPhill  Nov 28, 2017
 #2
avatar+80 
+1

what's the cube root of 5 though

gadzooks1753  Nov 28, 2017
 #3
avatar+87294 
+1

∛ 5   is irrational  .....we can only approximate its value

 

 

cool cool cool

CPhill  Nov 28, 2017
 #4
avatar+80 
+2

ok thanks CPhill coolcoolcool

gadzooks1753  Nov 28, 2017

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