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The square root (r) of a number (y) is that number which multiplied by itself gives the original number, ie:

if r = √y, then y = r × r = r².

Every number has two square roots as a negative number multiplied by a negative number is a positive number.

Examples:

√16 = 4 or -4 (written as ±4) since 4 × 4 = 16 and -4 × -4 = 16

√25 = ±5

√2.25 = ±1.5

Negative numbers do not have real square roots. They have complex square roots which are the square root of the positive number multiplied by the square root of -1 which is written as "i", examples:

√-1 = i

√-16 = ±4i

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โˆ™ 2016-04-09 07:28:18
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