# How do you simplify 4(1+9x)?

The distributive property states that a(b+c)=a⋅b+a⋅c. Let's use this to solve our problem:
$4 \left(1 + 9 x\right) = 4 \cdot 1 + 4 \cdot 9 x = 4 + 36 x$
$4 + 36 x$ is our answer.