$$\lim_{x\to7}\left(\frac{x-7}{\left(x^2-7\right)}\right)$$

$$\int2x\left(6x^2-12\right)dx$$

$$48\cdot3$$

$$-49\:.\:2$$

$$5x^2+10x+3=0$$

$$\left(7a^2b^2+5x^4\right)^2$$

$$\left(-3x^2y^3+8xy^4\right)\left(3x^2y^3+8xy^4\right)$$