Westonci.ca is the premier destination for reliable answers to your questions, provided by a community of experts. Explore in-depth answers to your questions from a knowledgeable community of experts across different fields. Experience the convenience of finding accurate answers to your questions from knowledgeable experts on our platform.

Select the correct answer.

What is the value of the expression given below?
[tex]\[ (8 - 3i) - (8 - 3i)(8 + 8i) \][/tex]

A. [tex]\(-80 - 43i\)[/tex]

B. [tex]\(-96 + 37i\)[/tex]

C. [tex]\(-80 + 43i\)[/tex]

D. [tex]\(-96 - 37i\)[/tex]


Sagot :

To solve the expression [tex]\((8 - 3i) - (8 - 3i)(8 + 8i)\)[/tex], we will simplify the components step-by-step.

First, compute the product [tex]\((8 - 3i) \cdot (8 + 8i)\)[/tex]:

1. Apply the distributive property (also known as the FOIL method):
[tex]\[ \begin{align*} (8 - 3i)(8 + 8i) &= 8 \cdot 8 + 8 \cdot 8i - 3i \cdot 8 - 3i \cdot 8i \\ &= 64 + 64i - 24i - 24i^2 \end{align*} \][/tex]

2. Simplify the expression by combining like terms and remembering that [tex]\(i^2 = -1\)[/tex]:
[tex]\[ \begin{align*} 64 + 64i - 24i - 24(-1) &= 64 + 40i + 24 \\ &= 88 + 40i \end{align*} \][/tex]

Now, subtract this product from the original complex number [tex]\((8 - 3i)\)[/tex]:
[tex]\[ (8 - 3i) - (88 + 40i) \][/tex]

3. Distribute the negative sign:
[tex]\[ \begin{align*} (8 - 3i) - (88 + 40i) &= 8 - 3i - 88 - 40i \\ &= 8 - 88 - 3i - 40i \\ &= -80 - 43i \end{align*} \][/tex]

Therefore, the value of the expression [tex]\((8 - 3i) - (8 - 3i)(8 + 8i)\)[/tex] is:
[tex]\[ \boxed{-80 - 43i} \][/tex]

Thus, the correct answer is:
A. [tex]\(-80 - 43i\)[/tex]