Given that we have two adjacent angles measuring \( (x + 18) \) and \( x \), and they are inside a right angle (90 degrees), we can set up the following equation:
\[ (x + 18) + x = 90 \]
Now we can combine the terms on the left side:
\[ 2x + 18 = 90 \]
To express it in the format you provided, we can say:
\((x + 18)x = 90 - x\).
However, this equation represents their sum. The wanted format looks like this:
\[ (x + 18) + x = 90 \]
This is broken down as follows:
- For \( (x + 18) \), we have the first angle.
- For \( x \), we have the second angle.
- The equation shows that their total equals 90 degrees.
If you want it as \( (x + _) x = _ \), we could choose a different way to present this equation, such as:
\[ (x + 18) \cdot 1 + x \cdot 1 = 90 \]
But that feels a bit contrived, as it essentially just multiplies by 1. The essential relationship is between the sums of the angles totaling to 90 degrees.
If you need further adjustments or clarifications, please let me know!