f(x) = 4x - x² - 2x
Vertex form of a parabola: y = a(x - h)² + k where (h, k) is the vertex of this parabola
y = a.(x - h)² + k
y = -1.(x - h)² + k
Let's factor:
f(x) = -x² - 2x + 4
f(x) = -(x + 1)² + 1 + 4
f(x) = -(x + 1)² + 5
So we don't even need to find the vertex, we can just factor.
Answer:
The numbers that work are: -15, 5, 3.5, and 4 3/4
Step-by-step explanation:
Subtract 5 from both sides of the equation. Which will give you 15≥3x. Then you divide both sides by 3 which will give you 5≥x.
20≥5+3x
<u>-5 -5</u>
15≥ 3x
<u>÷ 3 ÷ 3</u>
5 ≥ x
Answer: Lenayah's presentation was 12 minutes long.
Step-by-step explanation:
- Set up a proportion. 2/3 = 8/x.
- Cross multiply. 2x = 24
- Divide both sides by 2. x =12
Answer:
C
Step-by-step explanation:
y = 5x + 3
y = 5.5x + 2
0.5x = 1
x = 2
y = 13