Question

for which value of m, x + 3 is factor of the polynomial x
cube-2m x+21​

Answer 1

Substitute x= -3

(-3)^3 -2m (-3) +21 = 0
-27 +6m +21 = 0
-6 +6m =0
6m = 6
m= 1

Answer 2

Answer:

your answer is 10 dear

Step-by-step explanation:

let x+3 = 0

x=-3

p (x) = x^3-2mx+21

p (-1) = -1^3+2m (-1)+21

= -1-2m+21=0

= 20-2m = 0

-2m=-20

= m= -20/-2

= m = 10