Question

If x +1 is a factor of 2x^3 + ax^2 +2bx +1 then find the value of a and b were 2a - 3b =4

Answer 1

x+1=0
X=-1
Putting this on question
2x^3+ax^2+2bx+1
2(-1)^3+a(-1)^2+2b(-1)+1
-2+a-2b+1
-1+a-2b=0
a-2b=1