College Algebra / Alg 042 · Atom · ~20 seconds
The Square Root of a Square
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State
For every real number x, the square root of x² is the absolute value of x: √(x²) = |x|.
Show
√((−4)²) is √16, which is 4 — the distance of −4 from zero, not −4 itself.
Watch for
The bars guard the principal root when x might be negative.
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