The line of symmetry for the quadratic equation y = ax 2 - 8x - 3 is x = 2. what is the value of "a"?
a) -2
b) -1
c) 2

1.

the line of symmetry is x=2, means that the x coordinate of the vertex is x=2.

the point x=2 is the midpoint of the roots  and . 

so 



Remark: in the x-axis, if c is the midpoint of a and b, then 

2.
since and are roots 

and

3.
equalizing:







in the left side factorize a, in the left side factorize 8:



in the right side use the difference of squares formula:



simplify by 



substitute  with 4:



a=2

C)2

The first digit is in the middle school 100s place

Answer:

$4034.40

step-by-step explanation:

the perimeter of the field is the sum of the lengths of the four sides:

47 yd + 158 yd + 47 yd + 158 yd = 410 yd

the cost of 3 ft (1 yd) of fence is 3×$3.28 = $9.84.

so the cost of jake's wood perimeter fance is

(410 yd) × ($9.84 /yd) = $4034.40