Thus, ARIMA models with input series are sometimes referred to as transfer function models. In the preceding regression and intervention model examples, the transfer function is a single scale ...

The numerator of this fraction will factorise as there is a common factor of 3. This gives 3 (t + 2) 3 t. Now, there is clearly a common factor of 3 between the numerator and denominator.

GCSE Edexcel Algebraic fractions - Edexcel Simplifying rational expressions with factorising Algebraic expressions in fraction form are rational. Methods of adding, subtracting, multiplying and ...