упростите выражение x^2-(x^2-3x)(x+3)

2. Раскройте скобки, используя нужную форму инфинитива.
1. I hate (to bother) you, but the students are still waiting (to give) books for their work.
2. He seized every opportunity (to appear) in public: he was so anxious (to talk) about. 3. Is
there anything else (to tell) her? I believe she deserves (to know) the state of her sick brother.
4. He began writing books not because he wanted (to earn) a living. He wanted (to read) and
not (to forget). 5. I consider myself lucky (to be) to that famous exhibition and (to see) so many
wonderful paintings. 6. He seems (to know) French very well: he is said (to spend) his youth
in Paris. 7. The enemy army was reported (to overthrow) the defense lines and (to advance)
towards the suburbs of the city. 8. The woman pretended (to read) and not (to hear) the bell. 9.
You seem (to look) for trouble. 10. It seemed (to snow) heavily since early morning: the ground
was covered with a deep layer of snow. 11. They seemed (to quarrel): I could hear angry voices
from behind the door. 12. They are supposed (to work) at the problem for the last two months.
13. The only sound (to hear) was the snoring of grandfather in the bedroom. 14. Her ring was
believed (to lose) until she happened (to find) it during the general cleaning. It turned out (to
drop) between the sofa and the wall. 15. They seemed (to wait) for ages.