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

Answer:

$-1.5$

Step-by-step 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 $\frac{-b}{2a}$ to finc the x-coordinate of vertex of given parabola.

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

$\frac{-9}{2*3}$

$\frac{-3*3}{2*3}$

$\frac{-3}{2}$

$-1.5$

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