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Let F(x)=f(x)g(x)h(x) for all real x ,w...

Let `F(x)=f(x)g(x)h(x)` for all real `x ,w h e r ef(x),g(x),a n dh(x)` are differentiable functions. At some point `x_0,F^(prime)(x_0)=21 F(x_0),f^(prime)(x_0)=4f(x_0),g^(prime)(x_0)=-7g(x_0),` and `h^(prime)(x_0)=kh(x_0)`. Then k is________

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