Question

derive the formula(a+b+c)²=​

Answer 1

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Answer 2

Answer:

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

Step-by-step explanation:

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

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

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

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

Hope it helps