-4,2*(-7,5)

To calculate the expression \(-4,2 \times (-7,5)\), you first need to clarify the decimal format. Assuming you're using commas as decimal points (common in some regions), the numbers would be interpreted as:

• \(-4,2\) means \(-4.2\)
• \(-7,5\) means \(-7.5\)

Now, we can perform the multiplication:

\[ -4.2 \times -7.5 \]

Multiplying two negative numbers results in a positive number:

\[ 4.2 \times 7.5 \]

Calculating that:

\[ 4.2 \times 7.5 = 31.5 \]

Therefore, the result is:

\[ 31.5 \]