Please, multiply:3(3m + 4n) (m + 2n)

Please, multiply: $3\left(3m+4n\right)\left(m+2n\right)$

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Obiajulu

$3\left(3m+4n\right)\left(m+2n\right)=$

$=3\left(3m×m+3m×2n+4n×m+4nx×2n\right)=$

$=3\left(3{m}^{2}+6mn+4mn+8{n}^{2}\right)=$

$=9{m}^{2}+18mn+12mn+24{n}^{2}=$

$=9{m}^{2}+30mn+24{n}^{2}$