Common Algebra Mistakes
Example: Failure to Distribute Minus Sign

The Goal

Simplify the expression:


The Mistake

Find the algebra mistake:


(Roll the mouse over the algebra to see a hint in red)

The Correction


(Roll the mouse over the area above to see the correction in blue)

An Explanation

The minus sign must be distributed across all terms inside the parentheses: -(2x + 1) = -2x - 1.

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