Решить уравнение 4x^4-45x^2+81=0

решите систему:

x^2+2y=6

y=x-1

8 класс 

Переведите плиз)

My best  friend always knows howto cheer me up when Im sad.

My brother and I often fall out over small unimportant things.

My friend has never let down me yet.

Out History teacher had to split up because  we were giggling in the classroom.

I don t like those girls. They  think that they are the most beautiful in the class and show off their pretty clothes all the time.

My friend and I always stick together in difficult situations.

Tom was homesick at first, but  he cheered up after he met John

Раскрой скобки и где нужно приведи подобные слогаемые.

а)   -5 ( р - n + 3 )

б)   -2 ( 3х - 1) + 3 ( 6 - 2х ) 

в)   ( - а + 3b - 2 ) * ( - 4 ) 

г)   6 ( х - 4 ) - 5 ( 3 - х )