finding the factor using identity. (a-b)²-(b-c)²
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(a-b)square - (b-c)square
={(a-b) x (a-b)} - {(b-c) x (b-c)}
in the next step we have to take out the brackets
= a - b x a - b - b - c x b - c
= a2 - b4 -c2
= a2 + c2 - b4
= ac2 - b4
= (b4 + ac2)
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