09. The LU decomposition method is computationally more efficient than Gauss elimination method for solving. A) a single set of simultaneous linear equations B) a single set of simultaneous nonlinear equations C) multiple sets of simultaneous linear equations with different coeflicient matrices and the same right-hand side of the constant vector D) multiple sets of simultaneous linear equations with the same coefficient matrix but. different right-hand sides of constant vectors. C) less than ten simultaneous linear equations. 10 Using the three-point forward difference approximation, the second derivative of the function at: x=2 is given as A) 0.905 B) 7.275 C) 7.415 D) 8.180 E) 9.050