[tex]\displaystyle\bf\\\frac{k^{2} -49}{7k^{2} + k^{3} }=\frac{k^{2} -7^{2} }{k^{2} \cdot(7+k)}=\frac{(k-7)\cdot(k+7)}{k^{2} \cdot(7+k)}=\boxed{\frac{k-7}{k^{2} } }\\\\k=4\\\\\\\frac{k-7}{k^{2} } =\frac{4-7}{4^{2} } =-\frac{3}{16} =-0,1875\approx\boxed{-0,2}[/tex]
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[tex]\displaystyle\bf\\\frac{k^{2} -49}{7k^{2} + k^{3} }=\frac{k^{2} -7^{2} }{k^{2} \cdot(7+k)}=\frac{(k-7)\cdot(k+7)}{k^{2} \cdot(7+k)}=\boxed{\frac{k-7}{k^{2} } }\\\\k=4\\\\\\\frac{k-7}{k^{2} } =\frac{4-7}{4^{2} } =-\frac{3}{16} =-0,1875\approx\boxed{-0,2}[/tex]