Question

what is the value of k,if (-2)is a zero of the polynomial x²+5x+k​

Answer 1

Given :

• -2 is the zero of the polynomial x² + 5x + k

To find :

• the value of k .

Solution:

=> x² + 5x + k = 0

put x = -2

=>( -2)² + 5 (-2)+ k =0

=> 4 -10+k = 0

=> k = 6 .

Answer 2

Explanation:

Given: -2 is zero of polynomial x²+5x+k

To Find: value of k

Solution:

x²+5x+k = 0

[Put x = -2]

=> (-2)² + 5(-2) + k = 0

=> 4 - 10 + k = 0

=> 4 - 10 = -k

=> -6 = -k

=> k = 6

.°. k = 6