a) . p(x)+q(x)=x^3+3x^2-42-4+x^3+3x^2-5x+10=(x^3+x^3)+(3x^2+3x^2)-5x+(10-42-4)=2x^3+6x^2-5x-36 / p(x)-q(x)=x^3+3x^2-42-4-x^3-3x^2+5x-10=(x^3-x^3)+(3x^2-3x^2)+5x+(-10-42-4)=-56+5x / b)đề này sai sai

= ( x^3 +2x^3) +(5x^2 -4x^2)+(2x-x)+(3-4)=3x^+x^2+x-1

the future means of transport is solar powered car . it looks like a normal car . it has four wheels with four seatings . there is a solar panel on the roof to get sunshine from sun and create for the car . the people don' t need to buy gas but we only can use it when the weather is sunny . this vehicle is not only save energy but it also protects the environment in vietnam . i think this is a good invention that will help people in vietnam .

the same price

-advantages ; entertainment , we can join in activites of the festival , learn knowledge from festival , see the special and strange things , sell and buy the things at festival. _ disadvantages: having fights , that place is dirty and crowded, there are many crimes and accidents

is the red jet pack hers ?

football is seem one of the most popular game in england . young and old people all fond watching it . the important matches takes place at weekends .as soon as game begins , people startto shout and cheer for the one side or the other. some even begin throwing and fighting . they will stop doing these things after the game finishes