formule de calcul
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9 QuestionsShow answers
  • Question 1
    120 seconds
    Q.

    (a-3)(a+3)=

    answer choices

    a2-9

    a2-3

    a-9

    a2-6a+9

  • Question 2
    120 seconds
    Q.

    (x-5)(x+5)=

    answer choices

    x2-5

    x2-25

    x2+25

    x2-6x+25

  • Question 3
    120 seconds
    Q.

    (x+7)(x-7)=

    answer choices

    x2+49

    x2-7

    x2-49

    x2-14x+49

  • Question 4
    120 seconds
    Q.

    (x+2y)(x-2y)=

    answer choices

    x2-4y+4y2

    x-2y

    x2-2y2

    x2-4y2

  • Question 5
    120 seconds
    Q.

    (3x+5y)(3x-5y)=

    answer choices

    9x2-4y+25y2

    9x2-25y2

    3x2-5y2

    25x2-9y2

  • Question 6
    120 seconds
    Q.

    (x+√5)(x-√5)=

    answer choices

    x2-5

    x2-25

    x2+5

    x2-√5

  • Question 7
    120 seconds
    Q.

    (√7+√5)(√7-√5)=

    answer choices

    √7-√5

    2

    √7+√5

    12

  • Question 8
    120 seconds
    Q.

    (√6+1)(√6-1)=

    answer choices

    5

    √5

    √6+√5

    7

  • Question 9
    120 seconds
    Q.

    (x-1)(x+1)(x2+1)=

    answer choices

    x2-1

    x2+1

    x4+1

    x4-1

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