Question 585798
{{{ (4 - 5i)* (1 - i) }}}
{{{ 1*4 - 1*5i - 4i + 5i^2 }}}
Combine like terms. Note that {{{ i^2 = -1 }}}
{{{ 1*4 + 5*i^2 - 5i - 4i }}}
{{{ 4 + (-1)*5 -( 5i + 4i ) }}}
{{{ 4 - 5 - 9i }}}
{{{ -1 - 9i }}}
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{{{ ( 3 - 4i )*( 4 - 3i ) }}}
{{{ 12 - 16i - 9i + 12i^2 }}}
Combine like terms, again, {{{ i^2 = -1 }}}
{{{ 12 + 12*(-1) - ( 16i + 9i ) }}}
{{{ 12 - 12 - 25i }}}
{{{ -25i }}}
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