+0  
 
0
118
1
avatar

Two of the solutions to x^3 + ax^2 + bx + c = 0 are x = 1 and x = 2, and a + b = 1.  Find b.

 May 9, 2020
 #1
avatar+111566 
+1

Sub in x=1 and get equation (1)

 

Sub in x=2 and get equation (2)

 

(2)-(1) will give equation (3) and it will cancel out c so now the only pronumerals will be a and b

 

Seperate any groups of a+b that are there and put them =1

 

that will leave you with a little equation with just one variable.

 

I will let you take it from there.

 

If you have trouble show what you have done and someone will help you further.

 

 

Please no one answer over me.

And do not respond if the asker comes back with a no show of effort response.

 May 9, 2020

16 Online Users