Review Material: Simplifying numerical radical expressions
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Simplifying square roots (3:08)
and
cannot be simplified.
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Simplifying square roots of fractions (4:40)
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Simplifying square roots
Simplifying sums of radicals (4:41) He uses the correct
rather than the (false)
. Hooray!
Solve:
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Simplifying differences of radicals (5:45)
In this video he correctly remarks that “If
, there’s no need for the
.”
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Simplifying square root expressions (with no variables)
Introduction to rationalizing the denominator (10:17) [Example 1]
[Example 2]
[Example 3]Sal shows why multiplying by
doesn’t help and why multiplying by
does — difference of squares!
[Example 4]