So,
To complete the table, we're given the folloing equation:
All we need to do is to replace "x" by a number so we can find the value that takes P. For example, let's complete the table when x=0:
The, wen x=0, P=-30. So that's our fiirst missing value in the table.
We use the same process with the other values.
When x=2a:

So, the missing value when x=20 is P=50.
The process is the same with the other values:




So that's the complete table.