$\lim_{x\to a}\left(\frac{\left(x^2-\left(a+1\right)x+a\right)}{x^2-a^2}\right)$

$ac+bc+ad+bd$

$\frac{8x^2+4x\:-7}{x^2}$

$-1.7\cdot0.8$

$\lim_{x\to-1}\left(\frac{5-\sqrt{3x+29}}{x+1}\right)$

$\left(5y\right)^2$

$\frac{1}{4}\log_b\left(x\right)+3\log_b\left(y\right)-4\log_b\left(x\right)$