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

Step-by-step explanation:

We have been given an equation . We are asked to find the x-coordinate of the vertex of the parabola for our given equation.

We will use formula to finc the x-coordinate of vertex of given parabola.

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

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

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18