Question

For what value of k , is 3 a zero of the polynomial 2x(square)+x+k ?

1 point

(a) 21

(b) -21

(c) 22

(d) -22​

Answer 1

(b) -21

For what value of k is 3 a zero of the polynomial ? Put x=3 in the equation, Therefore, the value of k is -21.

Answer 2

Answer:

(b) -21 is correct

Step-by-step explanation:

Solution

ATQ,  3 is a zero of the polynomial 2x²+x+k,

So, x = 3 will satisfy the equation.

Therefore,

                              2x²+x+k = 0

or,                          2 X (3)²  + (3) + k = 0

or,                          2 X 9 + 3 + k = 0

or,                             18 + 3 + k = 0

or,                                 21 + k = 0

or,                                     k = -21