Cho pt: kx2 +(2k+1)x +k -1 = 0 a) Giải pt với k = 3 b) Với giá trị nào của m thì pt có 2 nghiệm pb

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Exercise 2: Rewrite the following sentences as directed • After + S+ had V3/ V-ed • Before= by the time + S+ V2/ V-ed 1 Sue cleaned the house. Then she fell asleep on the sofa.  AfterSue.................................................................................................. 2. Brian bought a new television. First, he checked all the prices.  Before Brian ................................................................................................ 3. First Trudy read the book. Then she decided that she didn’t like it.  After Trudy................................................................................................... 4. The police arrived too late, so the burglar escaped.  Before the police ....................................................................................... 5. He graduated from the college, then he taught at a primary school.  After he...................................................................................................... 6. Mary made a sandwich and then sat on the sofa.  Before Mary................................................................................................ 7. He took some medicine, then he felt a little better.  Before he..................................................................................................... 8. I worked very hard for the exam. Then I passed it.  Before I........................................................................................................ 9. They finished their work, then they went home. After they ...................................................................................................... 10. John went home but first he went to the store.  After John.................................................................................................