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