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-20*(2i-7)=
Your answer should be a complex number in the form
a+bi where
a and
b are real numbers.

$-20 \cdot(2 i-7)=$ $\newline$ Your answer should be a complex number in the form $a+b i$ where $a$ and $b$ are real numbers.

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Write equations of cosine functions using properties

Full solution

Q.

-20 \cdot(2 i-7)=

\newline

Your answer should be a complex number in the form

a+b i

where

a

and

b

are real numbers.

Distribute real number: Distribute the real number $-20$ to both terms of the complex number $(2i - 7)$ . We multiply $-20$ by each term inside the parentheses. $-20 \times (2i) = -40i$ $-20 \times (-7) = 140$
Multiply by terms: Combine the results of the distribution to form the complex number. $\newline$ The real part is $140$ , and the imaginary part is $-40i$ . $\newline$ So, the complex number in the form $a + bi$ is $140 - 40i$ .

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