Simplify 3x(x+3)

$3 x (x + 3)$

Step 1

Apply the distributive property.

$3 x \cdot x + 3 x \cdot 3$

Step 2

Multiply $x$ by $x$ by adding the exponents.

Move $x$ .

$3 (x \cdot x) + 3 x \cdot 3$

Multiply $x$ by $x$ .

$3 x^{2} + 3 x \cdot 3$

$3 x^{2} + 3 x \cdot 3$

Step 3

Multiply $3$ by $3$ .

$3 x^{2} + 9 x$

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