Question

Simplify (a+b+c) (a+b-c)​

Answer 1

Step-by-step explanation:

$a + b + c \: \times a + b - c$

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

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Answer 2

Answer:

$(a + b + c)(a + b + c)$

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

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

$= 2(ab + bc + ca) + {a}^{2} + {b}^{2} + {c}^{2}$

Step-by-step explanation:

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