Question

Find the coefficient of x in the expansion of (x+3)^3​

Answer 1

Step-by-step explanation:

Using the formula, (a+b)

3

=a

3

+b

3

+3a

2

b+3ab

2

(x+3)

3

=x

3

+27+9x

2

+27x

Therefore, coefficient of x is 27

or

Now, (x+3)3=x3+33+3x(3)(x+3)

[using identity ,(a+b)3=a3+b3+3ab(a+b)]

=x3+27+9x(x+3)

=x3+27+9x2+27x

Hence , the coefficient of x in (x+3)3 is 27.

Answer 2

Answer:

X=27

Step-by-step explanation:

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