3+2

x + 4 - 3x + 2

3*4

12 / 4

2 ^ 3

Sqrt[ 16  ]

Plot[  x^2 - 3x,  {x,-2,2}]

Plot[  x^3 + x - 7, {x,-1,1}]

Plot[ x^2-2x+1,{x,0.99,1.11}]