Saturday, November 30, 2013

what is the vertex: y = -x^2 - 4x - 3



Your Answer:
++y+=+-x%5E2+-+4x+-+3++
has a=-1, b=-4, c=-3
We can use the vertex formula:

%0D%0Ax%5Bmax%5D=%28-b%29%2F%282a%29=%28-%28-4%29%29%2F%282%28-1%29%29=-2%0D%0A

and substitute to get y:


++y+=+-%28-2%29%5E2+-+4%28-2%29+-+3+=-4%2B8-3=1+

so our vertex is v(-2,1)
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