The safety inspector notes that Ray also needs to plan for a vertical ladder through the center of the coaster's parabolic shape for access to the coaster to perform safety repairs. Find the vertex and the equation for the axis of symmetry of the parabola, showing your work, so Ray can include it in his coaster plan.

Question

afloridagirl · Answer

@jim_thompson5910

jim_thompson5910 · Answer

x^2+2x+8 is the same as 1x^2+2x+8

a = 1
b = 2
c = 8

you'll plug in the values of 'a' and 'b' into

h = -b/(2*a)

to get h = ???

afloridagirl · Answer

so it will look  like |dw:1467333487603:dw|

afloridagirl · Answer

so 4

afloridagirl · Answer

is that wrong?

jim_thompson5910 · Answer

c = 8 isn't used in h = -b/(2a)

jim_thompson5910 · Answer

h = -b/(2a)
h = -2/(2*1)
h = ???

afloridagirl · Answer

oh im sorry so -1

jim_thompson5910 · Answer

h = -1 is the x coordinate of the vertex

plug x = -1 into y = x^2+2x+8 to get y = ???

afloridagirl · Answer

5 @jim_thompson5910

afloridagirl · Answer

im sorry i had too do something

jim_thompson5910 · Answer

incorrect, try again

jim_thompson5910 · Answer

x = -1
x^2 = (-1)^2 = (-1)*(-1) = +1

afloridagirl · Answer

oh hell, this is what i did |dw:1467334585571:dw|