Discussion
On evaluating algebraic expression -3(4s - 2t) - 4(2s + 3t), answer will be
Answer: A
Expand both brackets, distributing the negative signs.
\[ -3(4s - 2t) = -12s + 6t \]
\[ -4(2s + 3t) = -8s - 12t \]
\[ (-12s - 8s) + (6t - 12t) = -20s - 6t \]
The \( -3 \) turns \( -2t \) into \( +6t \), which is the sign most often lost.
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