Discussion
If algebraic expression is [4(a + 2b - 3c) - 3(2b - 3c)] + 2a then answer will be
Answer: B
Expand each bracket, then collect.
\[ 4(a + 2b - 3c) = 4a + 8b - 12c \]
\[ -3(2b - 3c) = -6b + 9c \]
\[ (4a + 8b - 12c) + (-6b + 9c) + 2a = 6a + 2b - 3c \]
The \( -3 \) turns \( -3c \) into \( +9c \), which is what leaves only \( -3c \) at the end rather than \( -21c \).
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