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Online Quiz (WorksheetABCD)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics7.24 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 (3x-7y)2 9x2-42xy+7y23x2-42xy+49y29x2-21xy+49y29x2-42xy+49y2 Q 2: Expand (6x-5y)2 6x2-60xy+25y236x2-30xy+25y236x2-60xy+25y236x2-60xy+5y2 Q 3: Expand (4x-5y)2 16x2-40xy+25y24x2-40xy+25y216x2-40xy+5y216x2-20xy+25y2 Q 4: Expand (5x-3y)2 25x2-30xy+3y225x2-15xy+9y225x2-30xy+9y25x2-30xy+9y2 Q 5: Expand (3x-4y)23x2-24xy+16y29x2-24xy+16y29x2-24xy+4y29x2-12xy+16y2 Q 6: Expand (7x-2y)2 49x2-14xy+4y249x2-28xy+4y27x2-28xy+4y249x2-28xy+2y2 Q 7: Expand (7x-4y)2 49x2-56xy+4y249x2-28xy+16y249x2-56xy+16y27x2-56xy+16y2 Q 8: Expand (9x-4y)281x2-36xy+16y281x2-72xy+16y29x2-72xy+16y281x2-72xy+4y2 Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!