Question

 If 3 is a zero of polynomial 2x²+x+k , then k is = 
1.0
2.-21
3.21
4.9​

Answer 1

Answer:

k = number-2......- 21

Step-by-step explanation:

if 3 is a zero of polynomial 2x*x.+x+k , then put 3 instead of x

therefore,

2 (3*3) + 3 + k = 0

or, 18 + 3 + k = 0

or, 21 + k = 0

or, k = - 21

so, k = - 21