Answer:
-a^2 + ab
Step-by-step explanation:
(a^2 - 2ab +b^2) + (2a^2 + 2ab + b2) = 3a^2 + 2b^2
(a^2 - b^2) + (a^2 + ab + 3b^2) = 2a^2 + 2b^2 + ab
subtract the first part from the second part:
(2a^2 + 2b^2 + ab) - (3a^2 + 2b^2) = -a^2 + ab
Answer:
Okay, I think you mean't 4x-9=6x+12.
Step-by-step explanation:
x=-7
The equation that describes how the dependent variable (y) is related to the independent variable (x) is called the regression model. This equation is a result from the statistical modeling called the regression analysis. It is a method used to estimate relationships of a response variable and predictor variables being measured. The simplest type of regression is the linear regression where the relation ship between the independent variable x and the dependent variable y is being predicted. These equations can be used to predict values that are beyond the measuring values of the experiment. Also, these are used to describe the behavior of the variables.