Expand `(2x-3y)^4` by binomial theorem.

Explanation

To expand \((2x - 3y)^4\) using the Binomial Theorem, we follow these steps:

### Step 1: Identify the components for the Binomial Theorem
The Binomial Theorem states that:
\[ (a + b)^n = \sum_{k=0}^{n} \binom{n}{k} a^{n-k} b^k \]
In our case, we can rewrite \((2x - 3y)^4\) as \((2x + (-3y))^4\). Here, \(a = 2x\), \(b = -3y\), and \(n = 4\).
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