4x^2 + 3(2x^2 +1 ) = 2x ( 5x - 7 )
4x^2 + 3 ( 2x^2 + 1 ) - 2x ( 5x - 7 ) = 0
4x^2 + 6x^2 + 3 - 10x^2 + 14x = 0
14x + 3 = 0
14x = -3
x= -3/₁₄

If you should see Peter, tell him to be here at 8.00

c. x^2 - 9x - 10
= x^2 + x - 10x - 10
= ( x^2 + x ) - ( 10x + 10 )
= x ( x + 1 ) - 10 ( x + 1 )
= ( x - 10 ) ( x + 1 )

14160

1416

tick cho mk nha

1.Put the verbs in brackets in the correct tenses.

1,Let's(help)help Mom,Lan.She(clean)is cleaning the floor now

2,Mary uasually(travel) travels to work but today she(walk)is walking

3,Where are you(go) go now?I(go)am going to school.

4,What does your mother often(do) do in the evening?She often(read)reads books

2.Write the questions to the answers.

1,It's often hot in summer

Is it often hot in summer ?

2,No,it's not your pen.It's my pen

Is this my pen ?

3,Ho Chi Minh City is the biggest city in Viet Nam

.What is the biggest city in VN ?

4,It is four thousand and two hundred dong

How much is it?

3.Fill in the blank with one suitable word.

This is my brother his name is Ba.He eleven.He's ........the 6th form.He likes sports very much.Every day he plays sports although it's hot,he plays table tennis.When it's coo,he plays soccer.So he is very strong now.

4.Circle the words having the underlined letters pronounced differently.

1, A.bottle B.job C.movie D.chocolate

2, A.show B.how C.now D.cow

3, A.why B.shy C.only D.cry

4, A. have B.shave C.save D.make

5, A.skip B.time C.kite D.twice

6. A.gives B.teaches C.washes D.waches

7. A.often B.mother C.some D.dozen

8. A.can B.ceiling C.cook D.camp

9. A.house B.hour C.how D.here

1D
2. D
3. D
4. C
5. D
6. A
7. A
8. A
9. C
10. D
11.C
12. D
13.D
14. A
15. C
16. B

4. will get
7. Is he ready ... ?
8. will you cook ..
9. is knocking
10. isn't rain

He told them to open the door