$\"\"$

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The equation is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Find the fourth roots of $\"\"$ , write $\"\"$ in polar form.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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If $\"\"$ , then $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ or $\"\"$ .

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Polar form of $\"\"$ is $\"\"$ .

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$\"\"$

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Write an expression for fourth roots.

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$\"\"$

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$\"\"$ .

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Let $\"\"$ successively to find the fourth roots.

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

\

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$\"\"$

\

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$\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

\

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$\"\"$

\

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$\"\"$ .

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The fourth roots of $\"\"$ are $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .

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Thus, the solutions to the equation are $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .