Question

if one zero of a quadratic polynomial x2-5x+k is 3 then the value of k is . ​

Answer 1

Step-by-step explanation:

put the value of x =3

p(x)=(3)2-5(3)+k

=9-15+k

k=-6

Answer 2

Answer:

Required value of k is 6.

Step-by-step explanation:

Given Polynomial is ${x}^{2} - 5x + k$

Let $f(x) = {x}^{2} - 5x + k$

If f(x)=0 then 3 is one zero .

We are putting x=3 in the equation ${x}^{2} - 5x + k = 0$and get,

${3}^{2} - 5 \times 3 + k = 0$

$9 - 15 + k = 0$

We are separating variable and constant part,$k = 15 - 9$

$k = 6$

Required value of k is 6.

By this method we can find value of k for any value of x.Here x means root of the equation.