find the matrix representation

5) (For graduate students this problem is the university required mandatory \"graduate student question\" for 4000/6000 level courses, and for undergraduates it counts as Extra Credit). Find the matrix representation of the following linear transformation L : R? - R?; defined as: E (x1; X2) = (4x1 X2; 3x1 + 2x2) with respect to the bases B; = B2 = {(-1; 1), (4; 3)}