Question

find the value of a so that-2 is root of 2x^2-x+a​

Answer 1

I think this is the answer........I hope it helps u

Answer 2

Answer:

a = -10

Note:

★ The possible values of the variable which satisfy the equation are called its roots .

★ A quadratic equation can have atmost two roots .

Solution:

Here,

The given quadratic equation is :

2x² - x + a = 0

Also,

It is given that , x = -2 is a root of given equation .

Thus,

x = -2 must satisfy the given quadratic equation.

Now,

Putting x = -2 in the given quadratic equation , we get ;

=> 2x² - x + a = 0

=> 2(-2)² - (-2) + a = 0

=> 8 + 2 + a = 0

=> 10 + a = 0

=> a = -10

Hence,

The required value of a is (-10) .