Question

the coefficient of x³ in the expansion (x+3)³​

Answer 1

+3

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Answer 2

Answer:

$(x + 3) ^{3} \\ \\ = x ^{3} + 3x ^{2} \times 3 + 3x(3)^{2} + (3) ^{3} \\ \\ = x ^{3} + 9x ^{2} + 27x + 27 \\ \\ so \: coefficent \: of \: \\ x ^{3} = 1 \\ \\ formula \: used \\ \\( a + b) ^{3} \\ \\ = a ^{3} + 3a ^{2} b + 3ab^{2} + b ^{3}$

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