Question

Va rog sa imi spuneti cum se rezolva
A) (1+2a-3b)^2
B) (2x-y+1)^2
C) (2m-n-3p)^2

(Acel ^2 inseamna la puterea a doua)

Answer 1

A) (1+2a-3b)^2=1+4a²+9b²+4a-6b-12ab
B) (2x-y+1)^2=4x²+y²+1-4xy+4x-2y
C) (2m-n-3p)^2=4m²+n²+9p²-4mn-12mp+6np

formulele:
(a+b+c)²=a²+b²+c²+2ab+2ac+2bc
(a+b-c)²=a²+b²+c²+2ab-2ac-2bc
(a-b-c)²=a²+b²+c²-2ab-2ac+2bc
(a-b+c)²=a²+b²+c²-2ab+2ac-2bc