Mathématiques

Question

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)

2 Réponse

  • 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
  • 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

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