Question

A graph of a quadratic function is shown below.

graph of y equals negative 2 times x squared plus 40 x plus 600

Which of the following equations represents the axis of symmetry for the parabola shown?

y = 10x
x = 10
x = y + 10
y = x + 10

Answer 1

@mathstudent55 @mathmate @dan815 @Teddyiswatshecallsme

Answer 2

thats not a parabola

Answer 3

Yeah well the question is worded like that ._.

Answer 4

the picture u put up is not a parabola i mean the equation is that of a parabola

Answer 5

I mistaken ._.

Answer 6

y equals negative 2 times x squared plus 40 x plus 600
y=-2*x^2+40x+600
=-2(x^2-20x-300)
=-2( (x-30)(x+10) )
the roots are
x=30 and x=-10
the mid point is at (30+-10)/2 = 10

Answer 7

x=10 is the axis of symmetry

Answer 8

http://prntscr.com/82t7tw
As u can see along this line its a complete reflection

Answer 9

so its "symmetric" along that line

Answer 10

Thank you very much dan :D

Answer 11

that is the line x=10 because if u look at the coordinates along that vertical line, all its x coordinates of its points have 10 in it

Answer 12

Ok understood :P

Answer 13

i hope you really REALLY REALLY understand it

Answer 14

Yes I do thanks Dan!