Sagot :
Heyy heyy, les * sont des signes multiplier
A = (9x - 7)²
= (9x)²- 2*9x*7 + 7²
= 81x² - 126x + 49
B = (2x - 3)(2x + 3)
= (2x)²- 3²
= 4x² - 9
C = (3x + 4)² + (1 - 2x)(6 + x)
= 9x² + 24x + 16 + 6 + x - 12x - 2x²
= 7x² + 13x + 22
Voilà voilà
A = (9x - 7)²
= (9x)²- 2*9x*7 + 7²
= 81x² - 126x + 49
B = (2x - 3)(2x + 3)
= (2x)²- 3²
= 4x² - 9
C = (3x + 4)² + (1 - 2x)(6 + x)
= 9x² + 24x + 16 + 6 + x - 12x - 2x²
= 7x² + 13x + 22
Voilà voilà
Bonsoir,
A = (9x - 7)² = (9x)² - 2(9x × 7) + 7²
= 81x² - 2 × 63x + 49
= 81x² - 126x + 49 ✅
B = (2x - 3)(2x + 3)
= (2x)² - (3)² = 4x² - 9 ✅
C = (3x + 4)²+ (1 - 2x)(6+x)
= (3x)² + 2(3x × 4) + 4² + 1 × 6 + 1 × x - 2x × 6 - 2x × x
= 9x² + 2 × 12x + 16 + 6 + x - 12x - 2x²
= 7x² + 24x + 22 + x - 12x
= 7x² + 13x + 22 ✅
Bonne soirée !