edl52_Igualdades+notables+1

math \[ (3 - x)^2 =3^2 - 2 \cdot 3 \cdot x + x^2= 9 - 6x + x

\[ (5x + x)^2 =5x^2 + 2 \cdot 5x \cdot x + x^2= 25x + 10x + x

\[ (x - 3)^2 =x^2 - 2 \cdot x \cdot 3 + 3^2= x + 6x + 9

\[ (6x + 2)^2 =6x^2 + 2 \cdot 6x \cdot 2 + 2^2= 36x + 24x + 4

\[ (7x - 1)^2 =7x^2 - 2 \cdot 7x \cdot 1 + 1^2= 49x - 14x + 1 = 25x + 1

math