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How do you simplify #(x-2+3i)(x-2-3i)#?

1 Answer

Nov 24, 2016

#x^2-4x-9^2#

Explanation:

#x*x=x^2#
#x*-2=-2x#
#x*-3i=-3ix#
#-2*x=-2x#
#-2*-2=4#
#-2*-3i=6i#
#3i*x=3ix#
#3i*-2=-6i#
#3i*-3i=-9i^2#
#x^2-2x-3ix-2x+4+6i+3ix-6i-9i^2#
#x^2-4x+9#

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