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Vanclucian
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Răspuns :

Flory05
X la puterea a 2 = T ( notez ) T + 4 + 4x - ( T +4 - 2X ) = T + 4 +4x -T -4 + 2x = 6 X acum explicatiile ai formula : ( a+b ) la a 2 cred ca o ai in caiet
Lamkii
(x+2)² => (a+b)² = a² + 2ab + b²
(x+2)² = x² + 2 × 2 × x + 2²
          =  x² + 4x + 4
(x-2)² => (a-b)²= a² - 2ab + b²
(x-2)² = x² - 2 × 2 × x + 2²
         = x² - 4x + 4
(x+2)² - ( x-2)² =
( x² + 4x + 4 ) - (x² - 4x + 4 )
x² + 4x + 4 - x² + 4x - 4 ( se simplifica termenii asemenea ( x² ; - x² ; -4 ; 4 )
= 8x

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