Multiply the conjugates.
-$( 6 - 20 i ) ( 6 + 20 i )$
A) $- 364$
B) 26
C) 436
D) $- 14$

Name: Multiply the conjugates. -$( 6 - 20 i ) ( 6 + 20 i )$ A) $- 364$ B) 26 C) 436 D) $- 14$
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Question

Quizplus · Accepted Answer

When multiplying conjugates of a complex number in the form of $a+bi$, the resulting product is always the difference of squares of the real and imaginary parts. In this case, we have $(6-20i)(6+20i)$, which results in $6^2 - (20i)^2 = 36 + 400 = \boxed{436}$.

Multiply the Conjugates (6−20i)(6+20i)( 6 - 20 i ) ( 6 + 20 i )(6−20i)(6+20i)

Multiply the Conjugates $( 6 - 20 i ) ( 6 + 20 i )$