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  1. Simplifying roots of negative numbers (video) | Khan Academy

    This lesson dives into simplifying the square root of negative numbers using 'i', the principal square root of -1. We'll explore how to rewrite negative numbers as products, and use prime …

  2. Intro to square roots (video) | Radicals | Khan Academy

    Square roots can be both because the factors are the same number and same value, and also because positive*positive = positive squared and negative*negative = negative squared.

  3. Square roots review (article) | Khan Academy

    If you are simplifying square roots, you do not have to use prime factors. If you can find the perfect squares without going all the way down to prime factors, that's ok.

  4. Simplify roots of negative numbers (practice) | Khan Academy

    Simplify roots of negative numbers CCSS.Math: HSN.CN.A.1 Google Classroom Microsoft Teams

  5. Worked example: Cube root of a negative number - Khan Academy

    Learn how to find the cube root of negative 512 by breaking it down into prime factors. When we find groups of three of the same factor, we know that's a factor of the cube root. It helps to …

  6. Understanding square roots (video) | Khan Academy

    The default for a square root is to use the Principal Root, which is the positive root. If a problem wants you to use the negative root, there will be a "-" in front of the square root.

  7. Intro to square roots (video) | Khan Academy

    They might say the negative, let me scroll up a little bit, they might say something like the negative square root of nine. Well, that's going to be equal to negative three.

  8. Square root of decimal (video) | Radicals | Khan Academy

    Remember if we just wrote the square root symbol here, that means the principal root, or just the positive square root. But here P could be positive or negative, because if you square it, if you …

  9. i as the principal root of -1 (video) - Khan Academy

    The video explores the intriguing concept of imaginary numbers, specifically the imaginary unit 'i'. 'i' is equal to the square root of -1, and every complex number can be expressed as a + bi, …

  10. Intro to the imaginary numbers - Khan Academy

    Learn about the imaginary unit i, about the imaginary numbers, and about square roots of negative numbers.