Question

ए प्लस बी प्लस सी पावर टू​

Answer 1

Answer:

(a + b + c)²  = a²  + b²  + c² + 2ab + 2bc + 2ca

Step-by-step explanation:

Let (b + c) = x    

Then (a + b + c)² = (a + x)² = a² + 2ax + x²

                           = a²  + 2a (b + c) + (b + c)²

                           = a²  + 2ab + 2ac + (b²  + c² + 2bc)

                           = a²  + b²  + c²  + 2ab + 2bc + 2ca

Therefore, (a + b + c)²  = a²  + b²  + c² + 2ab + 2bc + 2ca

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Answer 2

Answer:

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

Step-by-step explanation:

$( {a + b + c})^{2}$

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

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

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

$= {a}^{2} + {b}^{2} + {c}^{2} + 2ab + 2bc + 2ac$ Hope this helps you and you Mark it as Brainlist.