bojoschlee bojoschlee
  • 21-10-2016
  • Mathematics
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Find the vertex: y= -4x^2-8x-7

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CheshireKat55
CheshireKat55 CheshireKat55
  • 21-10-2016
the vertex occurs a the point (4,-9) 
The easiest way to do this is to draw the graph, or create a table of test values. When you do this, you will see as you increase the value of X, the value of Y continue to shrink until u hit X=4. The graph starts to increase in. So you know that is the vertex. In general, all functions of the form ax^2 +bx + c will have only one vertex. So you can apply this method. 
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