Question

for what value of a, x-5 divide the polynomial x³-3x²+ax-10=?

Answer 1

-8 is the value of a in equation

Answer 2

X-5 =0
X=5
So instead of X we will put 5 in the given polynomial .
We will get
P(X) =40+5a
On equating :
-40/5=a that is a= -8