Développer niveau 3ème.
A =(10x + 7) * (7x - 10)
B= (8x - 7) * (8x + 7)
C= (10x + 2)²
D= (10x - 7 )²
E= (10x - 2) * (2x + 10)
A =(10x + 7) * (7x - 10)
B= (8x - 7) * (8x + 7)
C= (10x + 2)²
D= (10x - 7 )²
E= (10x - 2) * (2x + 10)
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Verified answer
A =(10x + 7) * (7x - 10)A = 70x² - 100x + 49x - 70
A = 70x² - 51x - 70
B= (8x - 7) * (8x + 7)
B = 64x² + 56x - 56x - 49
B = 64x² - 49
C= (10x + 2)²
C = 100x² + 40x + 4
D= (10x - 7 )²
D = 100x² - 140x + 49
E= (10x - 2) * (2x + 10)
E = 20x² + 100x - 4x - 20
E = 20x² + 96x - 20
Verified answer
A = (10x + 7) X (7x - 10)A = 10x X 7x + 10x X (- 10) + 7 X 7x + 7 X (- 10)
A = 70x² - 100x + 49x - 70
A = 70x² - 51x - 70
B = (8x - 7) X (8x + 7)
B = 8x X 8x + 8x X 7 - 7 X 8x - 7 X 7
B = 64x² + 56x - 56x - 49
B = 64x² - 49
C = (10x + 2)²
C = (10x)² + 2 X 10x X 2 + 2²
C = 100x² + 40x + 4
D = (10x - 7)²
D = (10x)² - 2 X 10x X 7 + 7²
D = 100x² - 140x + 49
E = (10x - 2) X (2x + 10)
E = 10x X 2x + 10x X 10 - 2 X 2x - 2 X 10
E = 20x² + 100x - 4x - 20
E = 20x² + 96x - 20