factorise: 100(x+y)^2-81(a+b)^2
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Step-by-step explanation:
100(a+ b)2-81(x+ y)2
[10(a +b)+[9(x +y)]×10(x +y)-9
(10a+10b+9x+9y)(10a+10b-9x-9y)
on the identity
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