Evaluate the expression for j = –4.

Question

Write your answer as a decimal or whole number.

–7 + 2.8j =

Answer 1

To evaluate the expression for \( j = -4 \), we substitute \(-4\) into the expression:

\[ -7 + 2.8j \]

Substituting \( j = -4 \):

\[ -7 + 2.8(-4) \]

Now, calculate \( 2.8 \times -4 \):

\[ 2.8 \times -4 = -11.2 \]

Now substitute \(-11.2\) back into the expression:

\[ -7 - 11.2 \]

Now, we can add these two values:

\[ -7 - 11.2 = -18.2 \]

Thus, the evaluated expression is:

\[ \boxed{-18.2} \]