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Algebra (a+b)(a-b)=a2 - b2 (a+b) 2 =a2 + 2ab + b2 (a-b) 2 =a2 - 2ab + b2 Numere reale conjugale: are conjugatul 2X+7X=9X 2X-5X=-3X 2 coeficient 2X X parte literala 2x –monom 2x+4y –binom POLInoame 2x+4y-7 –tirnom (a+b+c) 2 = a 2 +b 2 +c 2 = 2ab+2ac+2bc (a+b)(x+y)=ax+ay+bx+by ax + ay + bx + by = a(x+y)+b(x+y)=(x+y)(a+b) Daca ab=0 => a=0 sau b=0 Daca |x|=3 => x=3 sau x=-3