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