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Cuadrado: exponente dos.
Doble: multiplicado por dos.
x² + 1 = 2 . 13
x² + 1 = 26
x² = 26 - 1
x² = 25
x = √25
x = 5
Comprobamos:
x² + 1 = 2 .13
5² + 1 = 26
25 + 1 = 26
26 = 26
El número es 5.
√25 = 5
Ya que:
5 . 5 = 25
5² = 5
Ya que:
5 . 5 = 25