Răspuns :
[tex](2-x)^2=2^2-2*x*2+x^2=4-4x+x^2 \\ (3+x)^2=3^2+2*3*x+x^2=9+6x+x^2[/tex]
Vom folosii formulele de calcul prescurtat : (a-b)² = a² - 2ab + b² si
(a+b)²= a² + 2ab + b²
(1)... (2-x)² = 2²- 2*2*x + x² = 4-4x+x² ;
(2)... (3+x)²= 3²+2*3*x + 3² = 9+6x+x² ;
(a+b)²= a² + 2ab + b²
(1)... (2-x)² = 2²- 2*2*x + x² = 4-4x+x² ;
(2)... (3+x)²= 3²+2*3*x + 3² = 9+6x+x² ;