Question

Factorise 2(ab - cd ) - a square - b square + c square + d square

Answer 1

2ab - 2cd -a square - b square +( c square + d square)

2ab-2cd-(a+b) (a-b)+c square + d square + 2cd

= 2ab(-a-b) (a-b) + c square + d square

=2ab-a square -ab-ab+b square + c square + d square

=2ab- a square - 2ab + b square + c square + d square

= -a square + b square + c square + d square



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