$\left(3x+5\right)^2-\left(3x-5\right)^2$

$2x^2+1>4x-2x^2$

$\left(-49\right)-\left(-79\right)$

$\frac{\left(2p\right)^{-7}}{\left(2p\right)^{-10}}$

$\lim_{x\to1}\left(\frac{\sqrt{15-x}-4x^{\frac{1}{4}}}{x^2-5x+4}\right)$

$b-b-b$

$3\left(5x-2\right)-8\left(x+1\right)$