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Numerical approximations

g(x)=x^2-sqrt(2) solve(g(x)==0,x)

[x == -2^(1/4), x == 2^(1/4)]

What's the best/quickest way to get numerical approximations of these values of x? Thanks.

Numerical approximations

g(x)=x^2-sqrt(2) solve(g(x)==0,x)solve(g(x)==0,x) [x == -2^(1/4), x == 2^(1/4)]2^(1/4)]

What's the best/quickest way to get numerical approximations of these values of x? Thanks.