Polinomios | Cambio de Variable | Valor Numérico | ejercicio resuelto

Topic: Polynomials. Subtopic: Numerical Value. Method: Change of Variable. Good morning everyone, in the video I explain how to apply change of variable to polynomials. Exercise: If: S( x - 7 ) = 4x - 21 . Find: S( 3x + 1 )