Question

legea compozitiei punctele b,c​
ofer 17 p

Answer 1

b) xoy = xy+2x+2y+2 =

xy+2x+2y+4-2 =

x(y+2)+2(y+2)-2 =

(y+2)(x+2)-2 Adevarat

c) $\frac{1}{x}ox = (\frac{1}{x} +2)(x+2) = x+\frac{2}{x}+2x+4 = 3x+\frac{2}{x}+4$

Dar 1/xox = x

$3x+\frac{2}{x}+4 = x \\ 2x+\frac{2}{x}+4 = 0 \\ 2x^2+4x+2 = 0\\delta=16-16=0\\x=\frac{-4}{4} =-1$