Question

Determine which of the following statements is true concerning the values described in statement # 1 and statement # 2.
#1: The x-coordinate of the vertex of the equation
y = 2x2 − 4x + 12
#2: The x-coordinate of the vertex of the equation
y = 4x2 + 8x + 3

The value found in column #1 is greater than the value found in column #2.

The value found in column #1 is less than the value found in column #2.

The value found in column #1 is equivalent to the value found in column #2.

The relationship between column #1 and column #2 cannot be determined by the information given.

Answer 1

@campbell_st

Answer 2

do you know how to find the line of symmetry for a parabola...?

Answer 3

the reason is that the vertex lies on the line of symmetry.... and is the x value in the ordered pair

Answer 4

this is the pre-test it's testing knowledge

Answer 5

yep.... but the question I'm asking is

in a parabola

\[y = ax^2 +bx + c\]

do you know how to find the line of symmetry.

the reason is that the vertex in on the line of symmetry and the value of x in the line of symmetry equation is the x value in the vertex...

so its something that has some importance...

Answer 6

I don't know because I haven't began learning about it.

Answer 7

lol... ok for a parabola

\[y = ax^2 + bx + c\]

the equation for the line of symmetry is

\[x = \frac{-b}{2a}\]

this will also give the value of the x value in the vertex

so in your 1st question b= -4 and a = 2 2nd question b = 8, a = 4

so substitute them to get the corresponding x values... and then look at the statements and see which is true

Answer 8

Ok thank you lots!! :D