5+6

ans =

    11

p=[1,4,5]

p =

     1     4     5

q=[1,0,0,0,4,5,0]

q =

     1     0     0     0     4     5     0

roots(p)

ans =

  -2.0000 + 1.0000i
  -2.0000 - 1.0000i

roots(q)

ans =

        0          
   1.2207 + 1.0458i
   1.2207 - 1.0458i
  -0.7207 + 1.1898i
  -0.7207 - 1.1898i
  -1.0000          

polyval(q,3)

ans =

   780

3.^6+4*3.^2+5*3

ans =

   780

x=[-4:4]

x =

    -4    -3    -2    -1     0     1     2     3     4

polyval(q,x)

ans =

  Columns 1 through 4 

        4140         750          70           0

  Columns 5 through 8 

           0          10          90         780

  Column 9 

        4180

format compact
x=[-4:4]
x =
    -4    -3    -2    -1     0     1     2     3     4
polyval(q,x)
ans =
  Columns 1 through 4 
        4140         750          70           0
  Columns 5 through 8 
           0          10          90         780
  Column 9 
        4180
x=[3,6];
poly(x)
ans =
     1    -9    18
g=poly(x)
g =
     1    -9    18
roots(g)
ans =
     6
     3
h=g*4
h =
     4   -36    72
roots(h)
ans =
     6
     3
p
p =
     1     4     5
q
q =
     1     0     0     0     4     5     0
conv(p,q)
ans =
     1     4     5     0     4    21    40    25     0
ch=conv(p,q)
ch =
     1     4     5     0     4    21    40    25     0
length(ch)
ans =
     9
diary off