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Question
Factorise the following by the difference of two squares:
8xy2 - 18x3
Sum
Solution
8xy2 - 18x3
= 2x(4y2 -9x2)
= 2x[(2y)2 - (3x)2]
= 2x[(2y - 3x)(2y + 3x)]
= 2x(2y - 3x)(2y + 3x).
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Method of Factorisation : Difference of Two Squares
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