factorise a^2-b^2+2bc-c^2
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a² - b² + 2bc - c²
a² - b² - c² + 2bc
[ ( a² ) ( -1 ) ] [ ( b² -2bc + c² ) ]
using ( x - y )² = x² - 2xy + y²
( -a² ) ( b - c )²
a² - b² - c² + 2bc
[ ( a² ) ( -1 ) ] [ ( b² -2bc + c² ) ]
using ( x - y )² = x² - 2xy + y²
( -a² ) ( b - c )²
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