Question

For what value of ' k' ,is 3 a zero of the polynomial
$2x { } ^ {2} + x + k$

Answer 1

If we put x=3 in the given polynomial
Then according to the question we get

2×(3)^2+3+k=0

=>2×9+3+k=0

=>18+3+k=0

=>21+k=0

=>k=-21

hope this helps u