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x+x-1 = 3
2x-1 = 3
2x = 3+1
2x = 4
x = 4/2
x = 2
Ahora sustituyamos valores en la segunda ecuación
√x²+x⁻² -3
por regla de exponentes sabemos que x⁻² = 1/x²:
√x²+1/x²-3
√2²+1/2²+3
√4+1/4+3
sabemos que: 1/4 = 0.25:
√4+0.25+3
√7.25
2.69
Saludos....