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Blinn College

Algebra 1: Lesson 090

Advanced Radicals
Addition and FOILing

Lesson Description

Students learn to add or subtract radicals by first breaking down the given radicals and simplifying each term, then combining terms that have the same number inside the radical. For example, 15 root 2 + 6 root 2 = 21 root 2. Students also learn that a problem in the form (7 + 4 root 5)(2 - 3 root 5) can be simplified using the FOIL method, and a problem in the form (1 + root 3)^2 can be rewritten as (1 + root 3)(1 + root 3).

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