SOLUTION: Given the polynomial 3x^2-6x-18 what is the vertex of it's graph

Question 316554: Given the polynomial 3x^2-6x-18 what is the vertex of it's graph
Found 2 solutions by Fombitz, josmiceli:
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Complete the square to convert to vertex form,

where (h,k) is the vertex.

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(1,-21) is the vertex.
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Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
The vertex is midway between the 2 roots
When the equation is in the form

The formula to find roots is

Midway between the 2 roots is

The x coordinate of the vertex is at

The vertex is at (1,-21)
Here's the plot

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