expand the following :
${(2 a + 3 b)}^{3}$

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Solution

$(2 a + 3 b)^{3}$ ,

Now $(a + b)^{3} = a^{3} + b^{3} + 3 a^{2} b + 3 a b^{2}$

$∴ (2 a + 3 b)^{3} = 8 a^{3} + 27 b^{3} + 36 a^{2} b + 54 a b^{2}$ .

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