Bruno Batarelo

Zadatak 1
Naci nul. tocke i izracunati x za:

f(x)=2x2-4x-5
Postupak:
A=[2 -4 -6]
roots(A)
Rjesenje: 2.8708, -0.8708

Izracun f(4+4i)
Postupak:
Polyval(A, 4+4*i)


f(x)=3x3+2x2-x
Rjesenje:
Nul tocke: -1.0000, 0.3333
Polyval(): 64

5x4+x2+x+2
Rjesenje:
Nul tocke:
   0.5195 + 0.6827i
   0.5195 - 0.6827i
  -0.5195 + 0.5231i
  -0.5195 - 0.5231i

Polyval: -19.0000 + 1.0000i



Zadatak 2
Izracun sustava linearnih jednadzbi
Sustav 1:
3x1+2x2+8x3=0.5
x1+9x2+6x3=1
x1-x2+3x3=2 


Postupak:
a=[3 2 8
1 9 6
1 -1 3]

b=[0.5
1
2]

x=a\b

Rjesenje:
-4.7000
-0.7000
 2.0000


Sustav 2: 
8x1-3x3+5x4=2 
x2+7x4=3 
4x1+12x2-2x3+2x4=-5 
2x1-3x2+4x3=5 

Rjesenje:
 0.2404
-0.4464
 0.7950
 0.4923