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(w^2 -5)^2=w-1
w^4 -25= w-1
w^4-w=-1+25
w^3=24
w=3√24 (raíz cúbica)
w= 2.88
comprobación
√w^2 -5=w-1
√2.88^2 -5=2.88-1
1.8=1.8