Question

If one root the equation 2x² + kx + 4 = 0 is 2, then the other root is
(a)6
(b)−6
(c)−1
(d)1

Answer 1

SOLUTION :  

Option (d) is correct : 1

Let α be the one root  of the equation and β be the other root .

Given : 2x² + kx + 4 = 0  , α = 2

On comparing the given equation with ax² + bx + c = 0  

Here, a = 2 , b = k , c = 4

Product of zeroes = c/a  

α × β = c/a

2 ×  β = 4/2

2β = 2

β = 2/2  

β = 1

Hence, the other root of  the equation is β = 1.

HOPE THIS ANSWER WILL HELP YOU...

Answer 2

If one root the equation 2x² + kx + 4 = 0 is 2, then the other root is

(a)6

(b)−6

(c)−1

(d)1√√√