Question

sa se rezolve in R ecuatiile: x^3-2=x^3-2 ; 3x^2-8x=0 ; 2x^2-8=0

Answer 1

[tex]a)x^3-2=x^3-2\\ x^3-2-x^3+2=0\\ 0=0\Rightarrow x\in \mathbb{R}\\ \\ b)3x^2-8x=0\\ x(3x-8)=0\Rightarrow x\in \{0,\frac{8}{3}\}\\ \\ c)2x^2-8=0\\ 2x^2=8\\ x^2=4\Rightarrow x\in \{\pm 2\}\\ \text{Sper ca te-am ajutat.}[/tex]