$\left|\left(-3\right)-\left(-19\right)\right|$

$-9x^2-6+8x+11x^2-10x$

$\int\left(\frac{1}{x^2\sqrt{x^2+49}}\right)dx$

$10\cdot7.66$

$\left(x+1\right)\left(2x^{2}-2\right)\left(x^{3}+5\right)$

$5x\left(x+1\right)=2x\left(x+4\right)$

$\int\frac{4}{\left(x+2\right)^2}dx$