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The square root of 4 is +2 or 2. The square root of a number can be either positive or negative. This is because the square of +2 is 4 and the square of 2 is also 4. More »
Technically, the square root of a negative number cannot be taken, but if imaginary numbers are allowed, the answer would be 2i. It can be tempting for those people just learning how to deal with square roots to assume t... More »
A square root is the result of "unsquaring" a number, or the reversal of the process of squaring. The root is, as its name implies, a squared number reduced to its most basic form. More »
To find a number's square root, determine which two perfect squares the number lies between and estimate a fraction between those two perfect square roots. If it is a perfect square itself the square root can be arrived ... More »
An extraneous root is a solution, or root, introduced into an intermediate equation while attempting to solve another equation. It does not, however, represent the correct solution to the original equation to be solved. More »
The fourth root of 16 is 2. In mathematics, the fourth root of a number is a number r that yields z when raised to power 4, where 4 is the degree of the root. More »
The expression (x^2  2x  4) factors as (x + 1  sqrt(5))*(x + 1 + sqrt(5)), where sqrt(5) is the square root of 5. This quadratic polynomial is factored by completing the square, a method in which a particular number i... More »

Amazon Prime Benefits
Free 2day shipping, streamingvideo, music, photo storage & more.

Learn More About Alexa
Handsfree voice control for music,calling, smart home devices & more.

Shop Amazon Fire Tablets
Tablets designed for entertainmentat an affordable price.

Explore Amazon Smart Home
Shop for smart home devices thatwork with Alexa. See our guide too.

Meet the Fire TV Family
See our devices for streaming yourfavorite content and live TV.

Shop Echo & Alexa Devices
Play music, get news, control yoursmart home & more using your voice.