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Exercise

$x^{21}\left(-1+\frac{1}{x^{19}}\right)+4$

Step-by-step Solution

1

Multiplying polynomials $x^{21}$ and $-1+\frac{1}{x^{19}}$

$-x^{21}+x^{21}\frac{1}{x^{19}}+4$
2

Multiplying the fraction by $x^{21}$

$-x^{21}+\frac{x^{21}}{x^{19}}+4$
3

Simplify the fraction $\frac{x^{21}}{x^{19}}$ by $x$

$-x^{21}+x^{2}+4$

Final answer to the exercise

$-x^{21}+x^{2}+4$

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