Factoring Quadratic Functions

$$\left(7x+1\right)\left(x+3\right)$$  

$$\left(7x+3\right)\left(x+1\right)$$  

$$\left(7x-3\right)\left(x-1\right)$$  

none of these

$$\left(2x+1\right)\left(x-2\right)$$  

$$\left(2x-2\right)\left(x+1\right)$$  

$$\left(3x-2\right)\left(x+1\right)$$  

$$\left(3x+1\right)\left(x-2\right)$$  

$$\left(4x+1\right)\left(x-3\right)$$  

$$\left(4x-1\right)\left(x+3\right)$$  

$$\left(2x-1\right)\left(2x+3\right)$$  

$$\left(2x-3\right)\left(2x+1\right)$$  

$$\left(2x+3\right)\left(3x+2\right)$$  

$$\left(6x+1\right)\left(x+6\right)$$  

$$\left(x+2\right)\left(6x+3\right)$$  

$$\left(3x+1\right)\left(2x+6\right)$$