Factorise (a² + c² + 2ac) - b²
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(a² + c² + 2ac) - b²
= -b²a² + b²c² + 2abc
= -b²a² + b²c² + abc + abc
= -b²a² + abc + b²c² + abc
= ab(-abc) - bc(-bca)
= ab(-abc) - bc(-bca)
hope this helps you...
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