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\int _{0}^{4}x^{2}x\mathrm{d}x
Multiply -1 and -1 to get 1.
\int _{0}^{4}x^{3}\mathrm{d}x
To multiply powers of the same base, add their exponents. Add 2 and 1 to get 3.
\int x^{3}\mathrm{d}x
Evaluate the indefinite integral first.
\frac{x^{4}}{4}
Since \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} for k\neq -1, replace \int x^{3}\mathrm{d}x with \frac{x^{4}}{4}.
\frac{4^{4}}{4}-\frac{0^{4}}{4}
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.
64
Simplify.