Question

Write (-5 + 8i) + (-5 − 8i) as a complex number in standard form.

A) 10 − 13i
B) -10 + 13i
C)-10 + i
D)-10

Answer 1

-5 + 8i - 5 - 8i
Standard form is a + bi.
Combine like terms when adding or subtracting complex numbers.
-10 is the correct answer. Letter D

Answer 2

Option: D is the correct answer.

D) -10

Explanation:

We are given a expression as:

(-5 + 8i) + (-5 − 8i)

i.e. the expression is a addition of two complex numbers.

Hence, we combine the like terms in the given expression.

i.e. we write the expression as:

(-5 + 8i) + (-5 − 8i)= (-5-5)+(8i-8i)

(-5 + 8i) + (-5 − 8i)= -10+0.i

(-5 + 8i) + (-5 − 8i) = -10

Hence, the complex number is represented in standard form as:

-10