Решите задания 13, 14 по алгебре логики

Uses graphabc;
 const
  W = 600;
  H = 600;

 function F(x: real): real;
begin
  F := sqr(x);
end;

 var
  x0, y0, x, y, xLeft, yLeft, xRight, yRight: integer;
  a, b, fmin, fmax, x1, y1, mx, my: real;
 begin

  window.Init(0, 0, 800, 500, clwhite);
  window.IsFixedSize := true;
  xRight := 590;
  yRight := 590;
  a := -15;
  b := 6;
  fmin := -10;
  fmax := 20;
  mx := (xRight - xLeft) / (b - a);
  my := (yRight - yLeft) / (fmax - fmin);
   x0 := 380;
  y0 := 490;
  x1 := a;
   while x1 <= b do
  begin
     y1 := F(x1);
     x := x0 + round(x1 * mx);
     y := y0 - round(y1 * my);
     if (y >= 10) and (y <= 590) then SetPixel(x, y, clblack);
     x1 := x1 + 0.001 ;
  end;
end.