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OpenStudy (anonymous):
-x^2-3x+9
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OpenStudy (anonymous):
whats the prob here helpme? do you wanna solve for x?
OpenStudy (anonymous):
find the vertex
OpenStudy (anonymous):
ah ok, did you try first graphing this? you can see it if you graph it....say y=-x^2-3x+9
OpenStudy (amistre64):
id give it a shot, but apparently my negatives signs are off today ;)
OpenStudy (anonymous):
http://www.webgraphing.com/plotting_basic.jsp?gclid=CI2C_LPqhKgCFcVOHAodqhzCrw#
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OpenStudy (anonymous):
idk what i keep doing wrong
OpenStudy (amistre64):
-x^2-3x+9 the mirror image over the x axis is: x^2+3x -9; so whatever the y value for this is at the vertex, change its sign
OpenStudy (amistre64):
(-3/2,-(y)) 9 9(2) 9(4) 9-18 -36 -45 --- - ----- - ---- = ---------- = ---- ; opposite that maybe 4 2(2) 1(4) 4 4
OpenStudy (anonymous):
A plot is attached.
OpenStudy (amistre64):
(-3/2 , 45,4) ??
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