Question

if one zero of the quadratic polynomial ( kx² + 3 X + K ) is 2 , then the value of k is
(1) 5/6
(2) -5/6
(3) 6/5
(4) -6/5.
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Answer 1

option (4) is correct

because,

kx^2 +3X+ k =0

k(2)^2 + 3(2)+k=0

4k+6+k=0

5k+6=0

5k=-6

k=-6/5