college algebra
posted by zach w .
F(X)= 3x^2 30x70
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
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
im still having a hard time please help a little more

college algebra 
Steve
review what you know about the parabola
y = a(xh)^2 + k
Here, we have
y = 3(x+5)^2 + 5
vertex at (5,2)
axis at x = 5
yintercept at (0,5)
xintercepts 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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