1 | initial version |

If you're in a notebook environment and type 361-4*-216 into a cell and get the answer then in the cell underneath you would refer to the previous calculation using the _ symbol. So typing 2*_ will give you 2 times the calculation of the previous cell. I find it's easiest to assign calculations to variables, eg a=361-4*-216, after which you can use the variable in other calculation easily.

2 | No.2 Revision |

If you're in a notebook environment and type 361-4*-216 into a cell and get the answer then in the cell underneath you would refer to the previous calculation using the _ symbol. So typing 2*_ sqrt(_) will give you 2 times the square root of the calculation of in the previous cell. I find it's easiest to assign calculations to variables, eg a=361-4*-216, after which you can use the variable in other calculation easily.

3 | add picture |

If you're in a notebook environment and type 361-4*-216 into a cell and get the answer then in the cell underneath you would refer to the previous calculation using the _ symbol. So typing sqrt(_) will give you the square root of the calculation in the previous cell. I find it's easiest to assign calculations to variables, eg a=361-4*-216, after which you can use the variable in other calculation ~~easily.~~easily.

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