express 7i^7+7i^6+3i^3-2i^2+1 in the form of a+bi
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7 i⁷+ 7 i⁶ + 3 i³ - 2 i² + 1
=> 7 (-i) + 7(1) + 3(-i) - 2(1) + 1
=> - 7i - 7 - 3i - 2 + 1
=> -10i - 8
=> - 8 - 10i
=> - ( 8 + 10i )
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