Find the minimum possible value of
\[\sqrt{58 - 42x} + \sqrt{149 - 140 \sqrt{1 - x^2}}\]where $-1 \le x \le 1.$
Since $-1 \le x \le 1,$ there exists an angle $\theta,$ $0^\circ \le \theta \le 180^\circ,$ such that $\cos \theta = x.$  Then $\sqrt{1 - x^2} = \sin \theta.$

[asy]
unitsize(1 cm);

pair O, X, Y, Z;

O = (0,0);
X = (10,0);
Y = (0,3);
Z = 7*dir(40);

draw(O--X--Z--Y--cycle);
draw(O--Z);

label("$O$", O, SW);
label("$X$", X, E);
label("$Y$", Y, NW);
label("$Z$", Z, N);
label("$10$", (O + X)/2, S);
label("$3$", (O + Y)/2, W);
label("$7$",(O + Z)/2, SE);
label("$90^\circ - \theta$", (1.5,0.4));
label("$\theta$", (0.3,0.6));
[/asy]

Construct triangles $OXZ$ and $OYZ$ so that $OX = 10,$ $OY = 3,$ $OZ = 7,$ $\angle YOZ = \theta$ and $\angle XOZ = 90^\circ - \theta.$  Then $\angle XOY = 90^\circ.$

Also, by the Law of Cosines on triangle $YOZ,$
\[YZ = \sqrt{3^2 + 7^2 - 2 \cdot 3 \cdot 7 \cos \theta} = \sqrt{58 - 42x}.\]By the Law of Cosines on triangle $XOZ,$
\begin{align*}
XZ &= \sqrt{7^2 + 10^2 - 2 \cdot 7 \cdot 10 \cos (90^\circ - \theta)} \\
&= \sqrt{149 - 140 \sin \theta} \\
&= \sqrt{149 - 140 \sqrt{1 - x^2}}.
\end{align*}Thus, the expression we want to minimize is $YZ + XZ.$  By the Triangle Inequality, $YZ + XZ \ge XY = \sqrt{109}.$  Equality occurs when $Z$ is the point on $\overline{XY}$ such that $OZ = 7,$ so the minimum value is $\boxed{\sqrt{109}}.$