Which property is illustrated by this problem 14+18 = 18 + 14 additive identity additive property of addition commutative property of addition

Vertex form:  

A is correct

Step-by-step explanation:

Given:

This is parabolic equation and to write as vertex form.

Vertex form:

Take out -3 common from first two term

Add and subtract inside the parentheses square of half of coefficient of x.

Coefficient of x = 4 , half of 4  = 2 , square of 2 = 4

Add and Subtract 4 inside the parentheses

This is vertex form of given equation.