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b^3 - 4b^2 - 21b = 0 

 Dec 10, 2018

Best Answer 

 #1
avatar+18439 
+2

b^3 - 4b^2 - 21b = 0       Factor out 'b'

b (b^2-4b-21) = 0          factor

b (b-7)(b+3)   = 0   

         for this to = 0     either ( b = 0)      or b-7 = 0    (b=7)     or b+3 = 0   (b=-3)

 Dec 10, 2018
 #1
avatar+18439 
+2
Best Answer

b^3 - 4b^2 - 21b = 0       Factor out 'b'

b (b^2-4b-21) = 0          factor

b (b-7)(b+3)   = 0   

         for this to = 0     either ( b = 0)      or b-7 = 0    (b=7)     or b+3 = 0   (b=-3)

ElectricPavlov Dec 10, 2018

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