Factor out the greatest common factor from the expression. 
Definitions:
Residual Plot
A graph showing the residuals on the vertical axis and the independent variable on the horizontal axis, used to assess the fit of a model.
Regression Inferences
The process of drawing conclusions about population parameters based on a regression model fitted to a sample of data.
Proficiency Test
An evaluation designed to measure the knowledge, skills, or abilities in a specific area or profession.
Regression Line
A straight line that best fits the data points on a scatter plot, showing the relationship between two variables.
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