<PRE><B>Question 662626</B>

{{{(x-7-5i)(x-7+5i)}}}...multiply


{{{x^2-7x+5xi-7x+49-35i-5xi+35i-25i^2}}}


{{{x^2-7x+cross(5xi)-7x+49-cross(35i)-cross(5xi)+cross(35i)-25i^2}}}


{{{x^2-14x+49-25(-1)}}}


{{{x^2-14x+49+25}}}


{{{x^2-14x+74}}}

</PRE>