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Calculate the value
$i ^{ 3 }$
$- i$
It is $i^{3} = -i$
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 3 } }$
$i ^ { 3 }$ is calculated with exponent divided 
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } \color{#FF6800}{ + } \color{#FF6800}{ 1 } }$
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } \color{#FF6800}{ + } \color{#FF6800}{ 1 } }$
 Calculate $i ^ { 2 + 1 }$
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ i } ^ { \color{#FF6800}{ 1 } }$
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } } i ^ { 1 }$
 It is $i^2 = -1$
$\color{#FF6800}{ - } \color{#FF6800}{ 1 } i ^ { 1 }$
$- 1 i ^ { \color{#FF6800}{ 1 } }$
 If the exponent is 1, get rid of it as it is unnecessary 
$- 1 i$
$\color{#FF6800}{ - } \color{#FF6800}{ 1 } i$
 Multiplying any number by 1 does not change the value 
$- i$
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