Answer:
B) maximum at 15
Step-by-step explanation:
Factor the leading coefficient from the first two terms.
-(x^2 +6x) +6
Add the square of half the x-coefficient inside parentheses and subtract the same quantity outside.
-(x^2 +6x +9) +6 -(-9)
-(x +3)^2 +15
Compared to the form
a(x -h)^2 +k
we find a=-1, h=-3, k=15. The negative vertical scale factor (a=-1) means the parabola opens downward. The vertex is located at (h, k) = (-3, 15).
The maximum value is 15.
Answer:
y = 
Step-by-step explanation:
9x-4y = 20
<u><em>Given that x = -2</em></u>
<em>Putting in the above equation</em>
9(-2) -4y = 20
-18 - 4y = 20
-4y = 20+18
-4y = 38
<em>Dividing both sides by -4</em>
y = 
y = 
y = 
1. B(15 to 42)
2. B(8 to 20)
3. C(2:1)