Question

for what value of k is 3 a correct root of the equation 2xsquare+x+k=0​

Answer 1

Answer:

The polynomial is :

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.

Answer 2

Step-by-step explanation:

2x^2+x+k=0

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

2(9)+3+k=0

k=-18-3

k=(-21)