factorise: a2b+ab2+b2c+bc2+c2a+ca2+3abc
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a2b+ab2+b2c+bc2+c2a+ca2+3abc
=ab(a+b) + bc(b+c) + ca (c+a) + abc + abc +abc
= ab(a+b) +abc + bc (b+c) + abc + ca ( c+a)+ abc
= ab(a+b+c) +bc ( b+c+a) + ca ( c+a+b)
= ( a+b+c) ( ab+bc+ca)
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