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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.24 Special Products: (a-b)2 = a2-2ab+b2

Formula: (a-b)2 = a2-2ab+b2


Example:
Expand (5x-2y)2
Solution:
(5x-2y)2 is in the form of (a-b)2, we have 5x for a and 2y for b
= (5x-2y)2 = (5x)2-2.5x.2y+(2y)2
= 25x2-20xy+4y2


Directions: Solve the following questions. Also write at least ten examples of your own.
Q 1: Expand (7x-4y)2
49x2-56xy+4y2
49x2-28xy+16y2
49x2-56xy+16y2
7x2-56xy+16y2

Q 2: Expand (7x-2y)2
49x2-14xy+4y2
49x2-28xy+2y2
7x2-28xy+4y2
49x2-28xy+4y2

Q 3: Expand (4x-5y)2
16x2-40xy+25y2
4x2-40xy+25y2
16x2-40xy+5y2
16x2-20xy+25y2

Q 4: Expand (3x-7y)2
9x2-42xy+49y2
9x2-42xy+7y2
9x2-21xy+49y2
3x2-42xy+49y2

Q 5: Expand (5x-3y)2
5x2-30xy+9y2
25x2-30xy+3y2
25x2-30xy+9y2
25x2-15xy+9y2

Q 6: Expand (9x-4y)2
9x2-72xy+16y2
81x2-72xy+16y2
81x2-36xy+16y2
81x2-72xy+4y2

Q 7: Expand (3x-4y)2
9x2-12xy+16y2
3x2-24xy+16y2
9x2-24xy+16y2
9x2-24xy+4y2

Q 8: Expand (6x-5y)2
36x2-60xy+5y2
36x2-60xy+25y2
6x2-60xy+25y2
36x2-30xy+25y2

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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