# How do you evaluate #3x^2-4y^2# if #x=5# and #y=3#?

##### 1 Answer

Jun 7, 2017

The answer is

#### Explanation:

So, we start with the original problem:

Then we substitute the given

Now, according to the order of operations, we simplify the exponential powers first, thus, reducing the expression to this:

Then, we use the order of operations again and do the multiplication next:

We then use the order of operations a final time and finish off the expression with subtraction: