multiply to matrix with strings

hi everyone

how to multiply a matrix like

a =

     1     2     3     4
     5     6     7     8
     9    10    11    12
    13    14    15    16

and

b =

     (1*x)
     (2+x)
     (3*5x)
     (4*x^2)

and answer shown with 'x'

[José-Luis]

Please read the "Getting started" part of the documentation.

[Azzi Abdelmalek]

The question is not clear

Answer 1

[Andrei Bobrov]

syms x

b =[(1*x)
(2+x)
(3*5*x)
(4*x^2)];

a =[     1     2     3     4
5     6     7     8
9    10    11    12
13    14    15    16];

out = a*b