Question

for what value of k is 3 a zero of the polynomial 2x^2+x+kx​

Answer 1

Answer:

Step-by-step explanation:

putting x=3 and equating with 0 we will get the answer

here's the solution

2*3*3 +3+k3=0

18+3+k3=0

k3= -21

k= -7

Answer 2

The value of k is -21.

Step-by-step explanation:

Given : Polynomial $2x^2+x+k$

To find : For what value of k is 3 a zero of the polynomial ?

Solution :

Polynomial $2x^2+x+k$

Suppose, 3 is zero of polynomial for some value of k,

Then $2x^2+ x + k = 0$

Put x=3 in the equation,

$2(3)^2+3+ k = 0$

$18+3+ k = 0$

$21+ k = 0$

$k=-21$

Therefore, the value of k is -21.

#Learn more

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