Question

What is the x-coordinate of the vertex of the parabola whose equation is y = 3x2 + 9x?

Answer 1

The vertex is (-1.5, -6.75). So the x-coordinate is -1.5. Hope this helps and if so please leave a good rating and thanks. I really appreciate it. Have a nice day!

Answer 2

`-1.5`

Explanation:

We have been given an equation
`y=3x^2+9x`. We are asked to find the x-coordinate of the vertex of the parabola for our given equation.

We will use formula
`(-b)/(2a)` to finc the x-coordinate of vertex of given parabola.

Upon substituting our given values in above formula we will get,

`(-9)/(2*3)`

`(-3*3)/(2*3)`

`(-3)/(2)`

`-1.5`

Therefore, the x-coordinate of vertex of given parabola is
`-1.5`.