Question

21. (a + 2b + 3c) − (4a + 6b − 5c) is equivalent to:
A. −4a − 8b − 2c
B. −4a − 4b + 8c
C. −3a + 8b − 2c
D. −3a − 4b − 2c
E. −3a − 4b + 8c

Answer 1

I got D.

Answer 2

you are right

Answer 3

hint:
\[\begin{gathered}
\left( {a + 2b + 3c} \right) - \left( {4a + 6b - 5c} \right) = \hfill \\
= a + 2b + 3c - 4a - 6b + 5c \hfill \\
\end{gathered} \]