Question

For what value of k, is 3 a
zero of the polynomial 2x²+x+K ​

Answer 1

Answer:

i hope is this correct answer

Answer 2

2x² + x + k

Suppose, 3 is zero of polynomial for some value of k, then

2x² + x + k = 0

∴2(3)² + 3 + k = 0           (Putting x = 3)

∴2*9 + 3 + k = 0

∴18 + 3 + k = 0

∴21 + k = 0

∴k = -21

Thus, for k = -21, 3 is a zero of the polynomial.