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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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