Question

The line of symmetry for the quadratic equation y = ax2 + 8x - 3 is x = 4. What is the value of "a"? -2 -1 1

Answer 1

Answer: its -1

Step-by-step explanation: the other person is incorrect and i already tried 1 and got it wrong

Answer 2

Hi so im not so sure if this is right bc i dont know what y is but im pretty sure a= -2. i got this by plugging in x. so 8*4= 32... y=ax2 + 32 -3. then y=a8 + 32 - 3 next y= a8 + 29. so i tried -2 and it gave me a positive 13 and then i tried -11 and it gave me -59. And to be honest i believe it will be a positive answer so ima go with -2.