What is the axis of symmetry of the function f(x) =-(x+9)(x-21)
2 answers:
Answer:
x = 6
Step-by-step explanation:
The given equation is
We write the equation in standard form of parabola using FOIL
Now, we know that the axis of symmetry passes through the vertex. Hence, in order to find the vertex of the parabola, we find the x coordinate of the vertex.
x coordinate of the vertex is
Here, a = -1 b = 12
Therefore, the axis of symmetry is x = 6
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so... one train goes west and the goes the opposite way... alrite... so... notice, by the time 338 miles have been covered by both, it will have been "t" hours, and whatever "t" is, is the same amount of time the westbound train has been running as well as the eastbound train has been running.
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