The square root of 5, denoted 5 {\displaystyle {\sqrt {5}}} , is the positive real number that, when multiplied by itself, gives the natural number 5. Along with its conjugate − 5 {\displaystyle -{\sqrt {5}}} , it solves the quadratic equation x 2 − 5 = 0 {\displaystyle x^{2}-5=0} , making it a quadratic integer, a type of algebraic number.
The square root of 5, denoted 5 {\displaystyle {\sqrt {5}}} , is the positive real number that, when multiplied by itself, gives the natural number 5. Along with its conjugate − 5 {\displaystyle -{\sqrt {5}}} , it solves the quadratic equation x 2 − 5 = 0 {\displaystyle x^{2}-5=0} , making it a quadratic integer, a type of algebraic number.
Source: Wikipedia "Square root of 5" · CC BY-SA 4.0
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