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x^{4}-x^{2}+12x-\frac{10}{x^{2}}+5
Combine 14x and -2x to get 12x.
\frac{\left(x^{4}-x^{2}+12x+5\right)x^{2}}{x^{2}}-\frac{10}{x^{2}}
To add or subtract expressions, expand them to make their denominators the same. Multiply x^{4}-x^{2}+12x+5 times \frac{x^{2}}{x^{2}}.
\frac{\left(x^{4}-x^{2}+12x+5\right)x^{2}-10}{x^{2}}
Since \frac{\left(x^{4}-x^{2}+12x+5\right)x^{2}}{x^{2}} and \frac{10}{x^{2}} have the same denominator, subtract them by subtracting their numerators.
\frac{x^{6}-x^{4}+12x^{3}+5x^{2}-10}{x^{2}}
Do the multiplications in \left(x^{4}-x^{2}+12x+5\right)x^{2}-10.