Question

Please tell fast
Question is attached

Answer 1

Answer:

a= -1

Roots are 2 and -2.

Step-by-step explanation:

3x²+(a+1)x-12 = 0

Let roots be x and y.

x= -y (given)

x+y = 0

-(a+1)/3= 0

-a -1 = 0

a = -1

3x²+(a+1)x-12 = 0

3x²+(-1+1)x-12 = 0

3x²-12 = 0

3(x²-4) = 0

x²-(2)² = 0

(x-2)(x+2) = 0

x -2= 0 or x +2= 0

x= 2,-2