Question

expand (a+2b+c)^3 using formula ​

Answer 1

Answer:

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Answer 2

Answer:

$a^{2}$ + $4b^{2}$ + $c^{2}$ + 4ab + 4bc + 2ca

Step-by-step explanation:

consider 2b as x.

$(a+x+c)^{2}$ = $a^{2}$ + $x^{2}$ + $c^{2}$ + 2ax + 2xc + 2ca

                  = $a^{2}$ + $(2b)^{2}$ + $c^{2}$ + 2a[2b] + 2[2b]c + 2ca

                  = $a^{2}$ + $4b^{2}$ + $c^{2}$ + 4ab + 4bc + 2ca