Question

Find the value of a so that (-2) is a root of 2x² - x + a = 0
10
-10
9
-9​

Answer 1

Answer:

a=-10 is the correct answer...

Step-by-step explanation:

keep -2 in X place

2(-2)²-(-2)+a= 0

2(4)-(-2)+a= 0

8 -(-2)+a= 0

8+2+a= 0

10+a= 0

a= 0-10

a= -10

Answer 2

Answer:

(-10)

Step-by-step explanation:

Since (-2) is the zero of the polynomial.

So, ATQ

$0 = 2 {x}^{2} - x + a$

Putting x = (-2)

$0 = 2 {( - 2)}^{2} - ( - 2) + a$

0 = 2 X 4 + 2 + a

0 = 8 + 2 + a

0 = 10 + a

0 - 10 = a

-10 = a

a = (-10)

HOPE IT HELPS YOU