Question

2·$(x+1)^{2}$-3·(x-2)·(x+2)+5x·(x-3)-$(3x-1)^{2}$

2)   2(2x-1)-3(x-5)

Answer 1

A)2(x^2+2x+1)-3(x^2-4)+5x^2-15x-(9x^2-6x+1)
2x^2+4x+2-3x^2+12+5x^2-15x-9xla2+6x-1
-5x^2-5x+13

am  desfacut parantezele si apoi am adunat si  scazut unde era  nevoie si  in primul rand am ridicat la patrat binoamele)
B)4x^2-2-3x+15(desfaci parantezele)

Answer 2

Folosesti formulele (a+b)^2=a^2 + 2ab + b^2 si  (a-b)^2=a^2 - 2ab + b^2
2(x^2+2x+1) - 3(x^2-4)+5x^2-15x-9x^2+6x-1=2x^2+4x+2-3x^2+12+5x^2-15x-9x^2+6x-1= - 5x^2-5x+13