Giải phương trình:
a)x²-4x+4
b)2x²-x
c)x²-5x+6
d)x²+y²
e)x²+6x+10

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C. Complete the sentences by putting the verb in brackets into the correct tense.Use the Past tense
1.Then the two cars _________ (crash),Phil _______(stand) a few metres away. Fortunately, he wasn't hurt.
2. When I _______ (leave) the house,they _______(play) computer games.When I________ (get) back, they ________(still play) computergames!Can you belive that they ________(not move) for four hours!
3. Jared__________(jog) for two hours when we _______(meet) in the park the other day.

D.Join the sentences using the words/phrases given.Make all the necessary changes.
1. I wandered around for an hour.Then I found a cosy cafe to sit in. BEFORE
2. The children left for school.Then Fay started tidying up. UNTIL
3. Michelle worked for the company for three years.Then she got a promotion. WHEN
4. The thieves ran away. A while later the police arrived. BY THE TIME
5. Sam was absent and nobody informed him about the test. That's why he didn't study for it. BECAUSE
 

Giải phương trình:
e)4(x-3)²-(2x-1)(2x+1)=10
f) 25(x+3)²+(1-5x)(1+5x)=8
g)9(x+1)²-(3x-2)(3x+2)=10
h)-4(x-1)²+(2x-1)(2x+1)=-3

Giải phương trình:
a) (x-2)²-(x-3)(x+3)=6
b) (x+3)² + (4+x)(4-x)=10
c) (x+4)² + (1-x)(1+x)=7
d) (x-4)² -(x-2)(x+2)=6