# How do you simplify 3x^2y + 4 - 3x^2y?

##### 1 Answer
Jun 15, 2015

The answer is simply 4.

#### Explanation:

The subtraction property of 0 explains this one; it says that $a - a = 0$.

In this case, we have:

$3 {x}^{2} y + 4 - 3 {x}^{2} y$

The $3 {x}^{2} y$ and $- 3 {x}^{2} y$ cancel out, leaving you with 4.