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Simplifying
Simplify a square root that contains both a numerical perfect square and a variable squared, with a negative sign placed in front of the radical.
First, identify the expression whose square equals the radicand. Since , the principal square root is . Then apply the negative sign that sits in front of the radical:
This example combines two previously learned skills: simplifying square roots of variable expressions (take the square root of the coefficient and halve the variable's exponent) and applying a negative sign in front of the radical (evaluate the square root first, then negate). The negative sign is not part of the radicand — it is applied after the square root has been computed.
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Elementary Algebra @ OpenStax
Ch.9 Roots and Radicals - Elementary Algebra @ OpenStax
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Simplifying
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Learn After
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Technical Manual Formula Update
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