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Question
Factorise : 9x 2 + 3x - 8y - 64y2
Solution
9x 2 + 3x - 8y - 64y2
= 9x2 - 64y2 + 3x - 8y
= [ (3x)2 - (8y)2 ] + ( 3x - 8y )
= [( 3x + 8y )( 3x - 8y )] + ( 3x - 8y )
= ( 3x - 8y )( 3x + 8y + 1 )
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