Question

simplify (a-b-c) (a+b-c)​

Answer 1

Answer:

$= (a - b - c)(a + b - c)$

$= a ^{2} - ab - ac + ab - {b}^{2} - bc - ac + bc + {c}^{2}$

$= {a}^{2} - {b}^{2} + {c}^{2} - 2ac$

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