a) f(x) = 2x+1;   F(x) = x² +x + C;     F(0) = 0+0+C = 0      C=0

F(x) = x² + x 

б) f(x) = 3x² -2x    F(x) = x³ -x² + C;       F(1)=4;   1-1+C = 4;  C=4;

F(x) = x³ -x² +4

в) f(x) = x+2; F(x) = x² /2 +2x +C;       F(1)=3;   1/2 +2 + C = 3;   C=0,5;

F(x) = x² /2 + 2x +0,5.

г) f(x) = -x² + 3x;   F(x) = -x³ /3 + 3x² /2 + C;  F(2) = -1;  -2³ /3 + 3*4/2 + C = -1;  -8/3+6+C = -1;

C = -13/3

F(x) = -x³ /3+3x² /2 -13/3