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√49 = 7, entonces:
7+√x = 8
√x = 8-7
√x = 1 ... Elevo al cuadrado en ambos lados y me quedaría:
(√x)² = (1)²
x = 1 R//
Teniendo el valor de x, demostramos que la solución es correcta:
√49 + √x = 8
7 + √1 = 8
7 + 1 = 8