Question

Can someone explain this question to me?

Completely factor the following expression: $9x^2+3x$.

Answer 1

`\large{\boxed{\sf 3x(3x + 1)}`

Step-by-step explanation:

`\sf \rightarrow 9x^2 + 3x`

Rewrite the expression

`\sf \rightarrow 3x\cdot \:3x+3x`

In this expression, the term 3x is a common factor. So take it out

`\sf \rightarrow 3x(3x + 1)`

The expression is factored completely