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F2 Class Quiz 6: Difference of two squares identity.

Quiz by Ms Choi

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10 questions
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  • Q1

    (d + 6)(d − 6) =

    d2 − 6

    36 − d2

    6 − d2

    d2 − 36

    60s
  • Q2

    (4 + a)(a − 4) =

    a2 − 16

    16 − a2

     −16 − a2

    a2 − 4

    60s
  • Q3

    (−3 − x)(3 − x) =

    x2 + 9

     x2 - 9

    9 - x2 

     x2 + 9

    60s
  • Q4

    (−5 + w)(−w − 5) =

    −25 − w2 

    w2 − 25

    25 − w2 

    25 + w2 

    60s
  • Q5

    (9k + 2)(−9k + 2) =

    4 − 81k2

    4

     -81k2− 4

    81k2 - 4

    60s
  • Q6

    (−2a + 3b)(3b + 2a) =

    9b− 4a2

    4a2− 9b 

    3b− 2a2

    2a2− 3b 

    120s
  • Q7
    120s
  • Q8

    If (10a − 3)(10a + 3) ≡ 100a2 +  N, where  N is a constant, find N.

    N = 6

    N = -9

    N = 9

    N = - 6

    60s
  • Q9

    If (Mx − 2)(2 + Mx ) ≡ 121x2 - 4, where  M is a constant, find M.

    M = 11

    M = 12

    M = 21

    M = -11

    60s
  • Q10

    If (2x − 1)(−2x − 1) ≡ −4x2 + Ax + B, where A and B are constants, find and B.

    A = 4, = −1

    A = 4, B = 1

    A = 0, B = −1

     A = 0, B = 1

    120s

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