Question

if 3 is a zero of the polonomiyal,find thevalue of k 2x2+x+k

Answer 1

Answer:

For equal roots, discriminant D of equation 2x  

2

+kx+k=0, should be zero.

D=k  

2

−4(2)(k)=0

k  

2

−8k=0

k(k−8)=0

k=0,8

Step-by-step explanation:

Answer 2

Given,

x = 3

2x² + x + k = 0

2(3²) + 3 + k = 0

2(9) + 3 + k = 0

18 + 3 + k = 0

21 + k = 0

k = -21

Thus, the value of k is -21.