SOLUTION: what are the 2 x-intercept coordinates when the vertex is (-2,-8) and the y-intercept is (0,4)?
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Question 739832: what are the 2 x-intercept coordinates when the vertex is (-2,-8) and the y-intercept is (0,4)?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
The general form is:
The vertex is at ( -2,-8 )
The formula for the x-intercept of the vertex is:
-----------
So far I have
Plug in the vertex point ( -2,-8 )
Now I have
Plug in ( 0,4 )
------------
-----------------------
Use the quadratic formula
and
-------------------
The x-intercepts are at -.367007 and -3.63299
check:
Is the y-intercept at ( 0,4 ) ?
OK
Does it go through ( -2,-8 ) ?
OK
Here's the plot:
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