Simplify: `(-5)^(2)xx(-3)^3`

Answer

To simplify the expression \((-5)^{2} \times (-3)^{3}\), we can follow these steps:

### Step 1: Calculate \((-5)^{2}\)
\[ (-5)^{2} = (-5) \times (-5) = 25 \]

### Step 2: Calculate \((-3)^{3}\)
\[ (-3)^{3} = (-3) \times (-3) \times (-3) \]
Calculating this step-by-step:
- First, calculate \((-3) \times (-3) = 9\)
- Then, multiply \(9\) by \(-3\):
\[ 9 \times (-3) = -27 \]
So, \((-3)^{3} = -27\).

### Step 3: Multiply the results from Step 1 and Step 2
Now we have:
\[ 25 \times (-27) \]
Calculating this:
\[ 25 \times (-27) = -675 \]

### Final Answer
Thus, the simplified expression is:
\[ \boxed{-675} \]