Question

The coefficient of $x$ in the expansion of $(x+3{)}^3$ is:

• A. $1$
• B. $9$
• C. $18$
• D. $27$

Answer 1

The correct option is D $27$

Using the formula, $(a+b{)}^3=a^3+b^3+3a^{2}b+3a{b}^2$
$(x+3{)}^3=x^3+27+9x^2+27x$
Therefore, coefficient of $x$ is 27