The image shows a mathematical expression involving logarithms. The expression is written as:

\text{Nilai dari } \, ^2\log 20 + ^2\log 45 - ^2\log 180 - ^2\log 40 \, \text{adalah} \ldots

This seems to be using base-2 logarithms (denoted as $^2\log$).

We can solve this expression using logarithmic properties:

$^2\log 20 + ^2\log 45 - ^2\log 180 - ^2\log 40$

Step-by-step simplification:

1. Use the logarithmic sum property: $^2\log a + ^2\log b = ^2\log (a \times b)$ So: $^2\log 20 + ^2\log 45 = ^2\log (20 \times 45) = ^2\log 900$

2. **Use