Factorise  (a b)2 – (b c)2             

Dear student
We have:a-b2-b-c2=a2+b2-2ab-b2+c2-2bc=a2+b2-2ab-b2-c2+2bc=a2-2ab-c2+2bc=a2-c2+2bc-a=a-ca+c+2bc-a=-c-aa+c+2bc-a=c-a-a+c+2bNote: identity usedx2-y2=x+yx-yx±y2=x2+y2±2xy
Regards

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