Question

1. simplify: $(a + 3)^2LXB0\bigcirc$ $a^2 + 9LXB1\bigcirc$ $a^2 + 9a + 3$

Explanation:

Step1: Expand using square formula

$$(a+3)^2=(a+3)(a+3)$$

Step2: Apply distributive property

$$a(a+3)+3(a+3)=a^2+3a+3a+9$$

Step3: Combine like terms

$$a^2+(3a+3a)+9=a^2+6a+9$$

Answer:

$\boldsymbol{a^2 + 6a + 9}$ (the first option)