Question

if x+2 is factor of x3+ 2ax2+ax-1 then the value of a is.​

Answer 1

Step-by-step explanation:

use factor theorem as x+2 is factor of

x³-2ax²+16 so put x = -2 and equate the equation to 0

so putting x = -2

(-2)³-2a(-2)²+16 =0

-8-8a+16=0

-8a = -8

a = 8/8= 1

So,

a = 1