factorize fully
2x^2-9x+4
derivate x+1/x
1000/27
x^2-121
solve [0.07392]4
complete analysis of f(x)=x+1/x
8+4x-y/2=50
-16+-27+21+-19+14+-3
x^2+x-6
\frac{\left(-1\right)^3-3\left(-1\right)^2-2\left(-1\right)-5}{2\left(-1\right)^2-9\left(-1\right)+2}