In form f(x)=ax^2+bx+c
the axis of symmetry is -b/2a so
3/2=-b/2a
given
f(x)=3x^2+bx+4
a=3
b=b
-b/(2*3)=3/2
-b/6=3/2
-b=18/2
-b=9
b=-9
Answer:
First one Or Last. I think the last one though
Step-by-step explanation:
Let
x---------------> number of <span>bulbs produced per year
n--------------> number of years
</span>we know that
the pattern can be modeled through the following equation
x=6*[2^(n-1)]
for n=1 year
x=6*[2^(1-1)]----------> 6 bulbs
for n=2 year
x=6*[2^(2-1)]----------> 12 bulbs
for n=3 year
x=6*[2^(3-1)]----------> 24 bulbs
for n=8 year
x=6*[2^(8-1)]----------> 6*128=768 bulbs
the answer is 768 bulbs