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\int \frac{1}{x^{2}}-1\mathrm{d}x
Evaluate the indefinite integral first.
\int \frac{1}{x^{2}}\mathrm{d}x+\int -1\mathrm{d}x
Integrate the sum term by term.
-\frac{1}{x}+\int -1\mathrm{d}x
Since \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} for k\neq -1, replace \int \frac{1}{x^{2}}\mathrm{d}x with -\frac{1}{x}.
-\frac{1}{x}-x
Find the integral of -1 using the table of common integrals rule \int a\mathrm{d}x=ax.
-6^{-1}-6-\left(-1^{-1}-1\right)
The definite integral is the antiderivative of the expression evaluated at the upper limit of integration minus the antiderivative evaluated at the lower limit of integration.
-\frac{25}{6}
Simplify.