Question

. If one zero of the quadratic polynomial x² + 3x + k is 2, then the value of k is *


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Answer 1

Answer:

The value of k is -10      

Step-by-step explanation:

Given : Quadratic polynomial x² + 3x + k

One of the root is 2

To find : The value of k

Solution :

Let the given quadratic polynomial be f(x) = x²+ 3x + k

Given one of the zero of the quadratic polynomial is 2.

Hence f(2) = 0

Put x = 2 in f(x), we get

f(2) = 2² + 3(2) + k

0=4+6+k

0=10+k

k=-10

Therefore, The value of k is -10.

Answer 2

Answer:

K= -10

Step-by-step explanation:

If 2 is a root of the quadratic equation then it means at x= 2 the equation will become 0

Put x= 0 (2)

^2 + 3(2) + k = 0 . From Here we get K= -10