Question

2x^2 - 4x + a equals 9, when x = -3.​

Answer 1

substitute -3 in the equation

2(-3)^2-4(-3)+a=9

2(9)-4(-3)+a=9

18+12+a=9

30+a=9

a=9-30

a=-21

• i dont know if this is correct!

Answer 2

Answer:

a=-21

Step-by-step explanation:

2x^2-4x+a=9

given:x=-3

put the value of x in the above equation

so,2(-3)^2-4(-3)+a=9

2(9)+12+a=9

30+a=9

a=-21

hope it will help you!