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Math

Distributing a Negative Sign to Only the First Term

Removing parentheses after a minus sign but only changing the sign of the first term.

Quick check

Why students make it

The minus sign is easy to read as attached to just the first term instead of the whole group inside the parentheses.

The rule done right

A leading minus sign multiplies every term inside the parentheses by 1-1, so change the sign of each term.