Question

for which the value of m,x+3 is the factor of the polynomial x³-2mx+21​

Answer 1

Step-by-step explanation:

if x+3 is a factor of x³-2mx+21

then,

x+3=0

x= -3

on putting value of x= -3 in x³-2mx+21

gives 0

x³-2mx+21=0

(-3)³-2•m•-3+21= 0

-27+6m+21=0

6m-6=0

6m=6

m=1

.......666....