Question

if x=5/2 is a zero of the polynomial 2x² + kx-12,
Then find the value of a
k​

Answer 1

Answer:

Answer:Value of k = -1/5

Step-by-step explanation:

Given that;

x=5/2

substituting this value in the given polynomial;

2(5/2)2 +k(5/2)-12=0

2(25/4)+k(5/2)-12=0

(25/2)+(5k/2)-12=0

Now after taking the LCM;

(25+5k-24)/2=0

5k=-1

k=(-1/5)

Answer 2

2(5/2)²-k5/2)-12

2(25/4)-k(5/2)-12

(25/2)-k(5/2)-12

(25/2)-(5k/2)-12

25+5-12

-------------

2

=25+5-24

----------------

2

= -1. =-1/5