Question

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Answer 1

Step-by-step explanation:

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Answer 2

Question:

$( x + 3) {}^{3}$

Solution:

☆Using suitable cubic identity .

$(x + y) {}^{3} \\ = x {}^{3} + y {}^{3} + 3xy(x + y)$

$(x + 3) {}^{3}$

$= x {}^{3} + 27 + 3(x)(3)(x + 3)$

$= x {}^{3} + 27 + 9x(x + 3)$

$= x {}^{3} + 27 + 9x {}^{2} + 27x$

Is your required result.

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