D.O.T.S.

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

$$\left(2x-9\right)\left(2x+9\right)$$

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

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

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

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

$$\left(x+8\right)\left(x-8\right)$$

$$\left(5x-2\right)\left(5x-2\right)$$

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

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

$$x^2+36$$

$$x^2-36$$

$$2x^2-6$$

$$x^2-6$$

$$x^2+1$$

$$x^2-2$$

$$2x^2-1$$

$$x^2-1$$

$$9x^2-1$$

$$3x^2-1$$

$$3x^2+1$$

$$9x^2-2$$

$$4x^2+25$$

$$4x^2-5$$

$$4x^2-25$$

$$2x^2-25$$