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Express the following in the form a+bi ...

Express the following in the form a+bi
`(1-i)^(4)`

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The correct Answer is:
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`(1-i)^(4)=(1-i)^(2)*(1-i)^(2)`
`" "=(1+i^(2)- 2i)(1+i^(2)-2i)`
`" "=[1+(-1) - 2i][1+(-1)-2i]`
`" "=(-2i)(-2i)`
`" "=4i^(2)=4xx-1=-4`
`" "=-4+i*0`
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