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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 7 - Mathematics
4.40 Formula for a2-b2 Difference of Two Squares

Formula:
Consider the product (a+b).(a-b).
(a+b).(a-b) = a.a + b.a + a.(-b) + b.-b
= a2 + ab - ab - b2
Therefore (a+b)(a-b) = a2-b2
a2-b2 = (a+b)(a-b)

a2-b2 = (a+b)(a-b)

Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: (c-d)(c+d) = _____?
d2-c2
c2+d2
2c2-d2
c2-d2

Q 2: (p+q)(p-q) = _____?
p2-q2
q2-p2
p2+q2
2p2-2q2

Q 3: (3a-b)(3a+b) = _____?
9a2-3b2
6a2-b2
9a2-b2
3a2-b2

Q 4: (l-m)(l+m) = _____?
l2-m2
l2+m2
m2-l2
2l2-2m2

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


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