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Question
factorise: ax2 + b2y - ab2 - x2y
Sum
Solution
ax2 + b2y - ab2 - x2y
= ax2 - ab2 + b2y - x2y
= a(x2 - b2) + y(b2 - x2)
= a(x2 - b2) - y(x2 - b2)
= (x2 - b2)(a - y)
= (x - b)(x + b)(a - y)
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Factorisation by Grouping
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