17. It is known that the number $a$ satisfies the equation param1, and the number $b$ satisfies the equation param2. Find the maximum possible value of the sum $a+b$.

| param1 | param2 |  |
| :---: | :---: | :---: |
| $x^{3}-3 x^{2}+5 x-17=0$ | $x^{3}-3 x^{2}+5 x+11=0$ |  |
| $x^{3}+3 x^{2}+6 x-9=0$ | $x^{3}+3 x^{2}+6 x+17=0$ |  |
| $x^{3}-6 x^{2}+16 x-28=0$ | $x^{3}-6 x^{2}+16 x-4=0$ |  |
| $x^{3}+6 x^{2}+17 x+7=0$ | $x^{3}+6 x^{2}+17 x+29=0$ |  |
17. It is known that the number $a$ satisfies the equation param 1, and the number $b$ satisfies the equation param2. Find the greatest possible value of the sum $a+b$.

| param 1 | param2 | Answer |
| :---: | :---: | :---: |
| $x^{3}-3 x^{2}+5 x-17=0$ | $x^{3}-3 x^{2}+5 x+11=0$ | 2 |
| $x^{3}+3 x^{2}+6 x-9=0$ | $x^{3}+3 x^{2}+6 x+17=0$ | -2 |
| $x^{3}-6 x^{2}+16 x-28=0$ | $x^{3}-6 x^{2}+16 x-4=0$ | 4 |
| $x^{3}+6 x^{2}+17 x+7=0$ | $x^{3}+6 x^{2}+17 x+29=0$ | -4 |