Lesson: Squaring Numbers Ending in 5

Comment on Squaring Numbers Ending in 5

Does this work if the base is negative?
gmat-admin's picture

Yes. Keep in mind that x² = (-x)².

For example, 3² = 9, and (-3)² = 9.

Likewise, 35² = (-35)² = 1225, and 65² = (-65)² = 4225

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