`\qquad x^3-19x-30`
`=x^3-5x^2+5x^2-25x+6x-30`
`=x^2(x-5)+5x(x-5)+6(x-5)`
`=(x-5)(x^2+5x+6)`
`=(x-5)(x^2+2x+3x+6)`
`=(x-5)[x(x+2)+3(x+2)]`
`=(x-5)(x+2)(x+3)`
`x^3 - 19x - 30`
` = x^3 + 5x^2 + 6x - 5x^2 - 25x - 30`
` = x(x^2 + 5x + 6) - 5(x^2 + 5x + 6)`
` = (x-5)(x^2 + 5x + 6)`
` = (x-5)(x^2 + 2x + 3x + 6)`
` = (x-5)[x(x+2) + 3(x+2)]`
` = (x-5)(x+3)(x+2)`
4. Although she is tired, she still goes to school. Tired .............…………………………………………………………………. 6. The girl is a student. She dances very beautifully. The girl who ......................................................................................................... 7. The woman is a teacher. Her son is very naughty. The woman whose ................................................................................................. 8. I wasn’t given a gift until yesterday. It was not until.................................................................................................................. 9. If it doesn’t rain, our crop won’t be good. Unless ...................................................................................................................... 10. Although his leg was broken, he managed to get out of the car. In spite of ................................................................................................................ 11. People say he will be a good student next year. He......................................................................................................................... 12.He didn’t study hard last year so He didn’t pass the exam If............................................................................................................................. 13. Jane has sold the old car. She was given it by her father( RELATIVE CLAUSE). …………………………………………………………………………………….
1)Phân thức thành nhân tử C=(2x+3)^2-(x^2-6x+9) D=x^2-16y^2+5x+20y
Giải giúp em với nhé Nhanh lên
Giúp tui câu 2 với câu 4 đc hongg:<<
it was stolen in the___ last week ( điền 1 từ có 7 chữ, 3 âm tiết (?)
phân tích đa thức thành nhân tử: x^3-19x-30
Vẽ đồ thị hàm số và lập bảng biến thiên a. y=3x+1 b. y=|3x| c. y= |3x| - 1 Giúp em với ạ :((((
Giúp mình với trước 1 giờ chiều nay ăn
The smoke from factories will pollute the air >The Air
Supply the corect form of the words in brackets 1. Community..... have a lot of postive effects on students.( sever ) 2...... people find it difficut to have a job ( distable) 3. I'd like to work as a voluteer for a charity...... ( oranise ) 4. He made a 500 ... to charity ( donate ) 5. Soup kitten is a ... oranization that provides free meals for needy people.( profit) 6. The homeless sheeltirs are entirely staffed by... worker. (volunteer) 7. The orization is fundes by ... donnation ( charity) 8. We help me ... with house work and gardening .(old) . Mike ' s hobby is listenning to music . He gets a lot ... from listening to music. (enjoy ) 9. John is a stam .... He has a lot of rare and and valuable stamps.(collect) 10. One thied of children in the U.S. is or bese . ( weigh) 11. I have ... so I must go to a den tist ( tooth ) 12. Junk food is ..., so we shouldn 't eat too much iunk food (health) 13. Blood...gove blood for use in hospital (donate) 14. They aren't forced to do chrity work. They do it ...( volunteer ) 15. They opemed a shel to provide housing for the ... ( home ) Mn oi lam giup minh voi T-T
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