1) Se inlocuieste valorea lui x in functie cu 1.
f(1)= -2
f(1)= 1³ -2 * 1² -2*1 +1 <=> f(1)= 1-2-2=1 <=> f(1)= 2-2-2 ===> f(1)= -2
2)
x³ -2x² -2x +1 |x+1
-x³ -x² | x² -3x +1
/ -3x² -2x +1 |
3x²+3x |
/ x+1 |
-x-1 |
/ /
x³ -2x² -2x +1 : x+1 = x² -3x +1 rest 0