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##### [ (-2)^-2 + (-3)^-1 ]^-1 =...?

________________________________

-12

##### Explanation
```
-1
_              _
|   -2        -1 |
|(-2)    + (-3)  |
|_              _|

```

Solve the outer exponent first. We know that a^-1 = 1/a

```            1
= -------------
-2      -1
(-2)  + (-3)

1
= ---------------
1        1
----  -  -----
2
(-2)       3

1
= ---------------
1        1
----  -  -----
4        3

1
= ------------
3  -  4
---------
12

1
= ---------
-1
------
12

12
= 1 × - ---
1

= -12
```

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##### SHORTCUT TRICKS (Division)
• Divisible by 2 Shortcut trick
• Divisible by 3 Shortcut trick
• Divisible by 4 Shortcut trick
• Divisible by 5 Shortcut trick
• Divisible by 6 Shortcut trick
• Divisible by 7 Shortcut trick
• Divisible by 8 Shortcut trick
• Divisible by 9 Shortcut trick
• Divisible by 10 Shortcut trick