F2 Class Quiz 6: Difference of two squares identity.

Quiz by Ms Choi

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10 questions
• 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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