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king06
@king06
January 2021
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Bonjour
AIDEZ moi SVP DM de maths ex 4 Urgent pour que je comprends SVP
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Christine17
Bonsoir :
Rappelle :
(a-b)² = a²-2ab+b²
(a+b)² = a²+2ab+b²
(a-b)(a+b) = a²-b²
Alors :
A = (2x + 3)² = (2x)² + 2×2x×3 + 3² = 4x² + 12x + 9
B = (7 + 3x)² = 7² + 2×7×3x + (3x)² = 49 + 42x + 9x²
C = (4 - 5x)² = 4² - 2×4×5x + (5x)² = 16 - 40x + 24x²
D = (10x - 1)² = (10x)² - 2×10x×1 + 1² = 100x² - 20x + 1
E = (5x + 3)(5x - 3) = (5x)² - 3² = 25x² - 9
F = (7x - 4)(7x + 4) = (7x)² - 4² = 49x² - 16
J’espère t'avoir t'aider
1 votes
Thanks 1
nini999
Verified answer
A=(2x+3)²=4x²+12x+9
B=(7+3x)²=49+42x+9x²
C=(4-5x)²=16-40x+25x²
D=(10x-1)²=100x²-20x+1
E=(5x+3)(5x-3)=25x²-9
F=(7x-4)(7x+4)=49x²-16
2 votes
Thanks 1
king06
Amen
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Lista de comentários
Rappelle :
(a-b)² = a²-2ab+b²
(a+b)² = a²+2ab+b²
(a-b)(a+b) = a²-b²
Alors :
A = (2x + 3)² = (2x)² + 2×2x×3 + 3² = 4x² + 12x + 9
B = (7 + 3x)² = 7² + 2×7×3x + (3x)² = 49 + 42x + 9x²
C = (4 - 5x)² = 4² - 2×4×5x + (5x)² = 16 - 40x + 24x²
D = (10x - 1)² = (10x)² - 2×10x×1 + 1² = 100x² - 20x + 1
E = (5x + 3)(5x - 3) = (5x)² - 3² = 25x² - 9
F = (7x - 4)(7x + 4) = (7x)² - 4² = 49x² - 16
J’espère t'avoir t'aider
Verified answer
A=(2x+3)²=4x²+12x+9B=(7+3x)²=49+42x+9x²
C=(4-5x)²=16-40x+25x²
D=(10x-1)²=100x²-20x+1
E=(5x+3)(5x-3)=25x²-9
F=(7x-4)(7x+4)=49x²-16