SOLUTION: the vertex and x-intercepts y=(x-4)(x+2)

Question 447583: the vertex and x-intercepts y=(x-4)(x+2)
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

You know two points on the graph;
(4,0) and (-2,0),
for those are the you stated above
Since parabolas are symmetrical, you know that the coordinate of the vertex be

between these two coordinates(since they have the same value), somewhere along the line
plug into the equation, and see what value you get for :

so, the vertex is at (1,-9)

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