Sagot :
Bonjour,
1) A = (3x + 2)² - (3x - 2)²
A = (9x² + 12x + 4) - (9x² - 12x + 4)
A = 9x² + 12x + 4 - 9x² + 12x - 4
A = 24x
2) 3002² - 2998²
= (1000 × 3 + 2)² - (1000 × 3 - 2)²
= 1000 × 24 = 24 000
Bonjour,
1) A = (3x + 2)² - (3x - 2)²
A = (9x² + 12x + 4) - (9x² - 12x + 4)
A = 9x² + 12x + 4 - 9x² + 12x - 4
A = 24x
2) 3002² - 2998²
= (1000 × 3 + 2)² - (1000 × 3 - 2)²
= 1000 × 24 = 24 000