Sagot :
Bonjour
A = ( 6 + x ) ² = 6² + 12x + x² = 36 +12x+x²
B = ( 2x-5)(2x+5) = (2x)² - 5² = 4x² - 25
C = ( 2x-3)² = (2x)² - 3*2x*2 + 3² = 4x² -12x + 9
Bonjour
A = ( 6 + x ) ² = 6² + 12x + x² = 36 +12x+x²
B = ( 2x-5)(2x+5) = (2x)² - 5² = 4x² - 25
C = ( 2x-3)² = (2x)² - 3*2x*2 + 3² = 4x² -12x + 9