?

\[\sqrt{2 \cdot {x}^{2}} \]

(FPCore (x) :precision binary64 (sqrt (* 2.0 (pow x 2.0))))

double code(double x) {
	return sqrt((2.0 * pow(x, 2.0)));
}

real(8) function code(x)
    real(8), intent (in) :: x
    code = sqrt((2.0d0 * (x ** 2.0d0)))
end function

public static double code(double x) {
	return Math.sqrt((2.0 * Math.pow(x, 2.0)));
}

def code(x):
	return math.sqrt((2.0 * math.pow(x, 2.0)))

function code(x)
	return sqrt(Float64(2.0 * (x ^ 2.0)))
end

function tmp = code(x)
	tmp = sqrt((2.0 * (x ^ 2.0)));
end

code[x_] := N[Sqrt[N[(2.0 * N[Power[x, 2.0], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]

\sqrt{2 \cdot {x}^{2}}

Reproduce?

Please include this information when filing a bug report:

herbie shell --seed 2023241 
(FPCore (x)
  :name "sqrt D (should all be same)"
  :precision binary64
  (sqrt (* 2.0 (pow x 2.0))))

inexact?: contract violation expected: number? given: (ival (bf "-2.098578716467387692404358116883839070632e323228496") (bf "2.098578716467387692404358116883839070632e323228496"))		L	C
real->bigfloat	/usr/share/racket/pkgs/math-lib/math/private/bigfloat/mpfr.rkt	470	0
...row-higher-order.rkt:375:33	/usr/share/racket/collects/racket/contract/private/arrow-higher-order.rkt	375	33
arg->precision	/home/nightlies/herbie/arb-support/src/programs.rkt	138	11
f	/home/nightlies/herbie/arb-support/src/programs.rkt	190	2
(unnamed)	/home/nightlies/herbie/arb-support/src/ground-truth.rkt	23	2
search-step	/home/nightlies/herbie/arb-support/src/searchreals.rkt	37	0
find-intervals	/home/nightlies/herbie/arb-support/src/searchreals.rkt	87	0
make-sampler	/home/nightlies/herbie/arb-support/src/sampling.rkt	94	0
sample-points	/home/nightlies/herbie/arb-support/src/ground-truth.rkt	64	0
setup-context!	/home/nightlies/herbie/arb-support/src/mainloop.rkt	293	0
get-alternatives/report	/home/nightlies/herbie/arb-support/src/sandbox.rkt	148	0
(unnamed)	/home/nightlies/herbie/arb-support/src/sandbox.rkt	247	6
(unnamed)	/usr/share/racket/pkgs/profile-lib/main.rkt	40	10
profile-thunk	/usr/share/racket/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/usr/share/racket/collects/racket/engine.rkt	42	24