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Practice this lesson yourself on khanacademy.org right now: https://www.khanacademy.org/math/pre-algebra/exponents-radicals/radical-radicals/e/simplifying_radicals?utm_source=yt&utm_medium=desc&utm_ca...
Solving quadratics by taking square roots. Imaginary roots of negative numbers watch the next lesson. If you purchase using links below it will help support making future math.
Simplify square roots w/variables. Advanced topics khan academy tutorial.
This lesson teaches how to find the square root of a term that has variables and numbers, my recommended calculators. Worked examples of taking expressions with square roots and all the perfect squares out roots.