Question

( a+ 2b+c)² expand ​

Answer 1

Answer:

thus is a formula of a+2ab+c whole square

Answer 2

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

As like that,

$\tt {(a + </u></strong><strong><u>2</u></strong><strong><u>b + c)}^{2} = {a}^{2} + {</u></strong><strong><u>4</u></strong><strong><u>b}^{2} + {c}^{2} + 2ab + </u></strong><strong><u>4</u></strong><strong><u>bc + </u></strong><strong><u>2</u></strong><strong><u>ca$