Question

10.If x + a is a factor of 2x^3 + 2ax + 5x + 10, find a​

Answer 1

Step-by-step explanation:

let f(x) =2x^3 +2ax +5x+10

It is given that x+a is a factor of 2x^3 +2ax+5x+10

that is ,

x+a =0

x=-a

according to question

f(-a)= 2(-a)^3 + 2a*-a + 5*-a +10

f(-a)= -2a -2a^2 - 5a +10

f(-a)=-2a^2 -7a +10

f(-a)=