Posted by **zach w** on Wednesday, November 14, 2012 at 12:26pm.

F(X)= -3x^2 -30x-70

what is the vertex

what is the axsis of symmetry

what are the intercept

what is the domain

what is the range

intervals increase

intervals decrease

- college algebra -
**Steve**, Wednesday, November 14, 2012 at 1:54pm
you can see it's a parabola. By completing the square, you get

y = -3(x^2 + 10x + 25) + 5

y = -3(x+5)^2 + 5

you should be able to read off most of the answers you need from that.

- college algebra -
**zach w**, Wednesday, November 14, 2012 at 2:07pm
im still having a hard time please help a little more

- college algebra -
**Steve**, Wednesday, November 14, 2012 at 2:20pm
review what you know about the parabola

y = a(x-h)^2 + k

Here, we have

y = -3(x+5)^2 + 5

vertex at (-5,2)

axis at x = -5

y-intercept at (0,5)

x-intercepts where 3x^2+30x+70 = 0, or

x = 1/3 (-15±√15)

domain is all reals

range is all reals <= 5

increase for x < -5

decrease for x > -5

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