Integrand size = 16, antiderivative size = 42 \[ \int x \sqrt {9+12 x+4 x^2} \, dx=-\frac {3}{8} (3+2 x) \sqrt {9+12 x+4 x^2}+\frac {1}{12} \left (9+12 x+4 x^2\right )^{3/2} \]
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Time = 0.01 (sec) , antiderivative size = 42, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.125, Rules used = {654, 623} \[ \int x \sqrt {9+12 x+4 x^2} \, dx=\frac {1}{12} \left (4 x^2+12 x+9\right )^{3/2}-\frac {3}{8} (2 x+3) \sqrt {4 x^2+12 x+9} \]
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Rule 623
Rule 654
Rubi steps \begin{align*} \text {integral}& = \frac {1}{12} \left (9+12 x+4 x^2\right )^{3/2}-\frac {3}{2} \int \sqrt {9+12 x+4 x^2} \, dx \\ & = -\frac {3}{8} (3+2 x) \sqrt {9+12 x+4 x^2}+\frac {1}{12} \left (9+12 x+4 x^2\right )^{3/2} \\ \end{align*}
Time = 0.10 (sec) , antiderivative size = 30, normalized size of antiderivative = 0.71 \[ \int x \sqrt {9+12 x+4 x^2} \, dx=\frac {x^2 \sqrt {(3+2 x)^2} (9+4 x)}{6 (3+2 x)} \]
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Result contains higher order function than in optimal. Order 9 vs. order 2.
Time = 2.00 (sec) , antiderivative size = 21, normalized size of antiderivative = 0.50
method | result | size |
default | \(\frac {\operatorname {csgn}\left (2 x +3\right ) \left (2 x +3\right )^{2} \left (4 x -3\right )}{24}\) | \(21\) |
gosper | \(\frac {x^{2} \left (9+4 x \right ) \sqrt {\left (2 x +3\right )^{2}}}{12 x +18}\) | \(27\) |
risch | \(\frac {2 \sqrt {\left (2 x +3\right )^{2}}\, x^{3}}{3 \left (2 x +3\right )}+\frac {3 \sqrt {\left (2 x +3\right )^{2}}\, x^{2}}{2 \left (2 x +3\right )}\) | \(44\) |
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Time = 0.24 (sec) , antiderivative size = 11, normalized size of antiderivative = 0.26 \[ \int x \sqrt {9+12 x+4 x^2} \, dx=\frac {2}{3} \, x^{3} + \frac {3}{2} \, x^{2} \]
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Time = 0.32 (sec) , antiderivative size = 24, normalized size of antiderivative = 0.57 \[ \int x \sqrt {9+12 x+4 x^2} \, dx=\left (\frac {x^{2}}{3} + \frac {x}{4} - \frac {3}{8}\right ) \sqrt {4 x^{2} + 12 x + 9} \]
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Time = 0.28 (sec) , antiderivative size = 44, normalized size of antiderivative = 1.05 \[ \int x \sqrt {9+12 x+4 x^2} \, dx=\frac {1}{12} \, {\left (4 \, x^{2} + 12 \, x + 9\right )}^{\frac {3}{2}} - \frac {3}{4} \, \sqrt {4 \, x^{2} + 12 \, x + 9} x - \frac {9}{8} \, \sqrt {4 \, x^{2} + 12 \, x + 9} \]
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Time = 0.27 (sec) , antiderivative size = 31, normalized size of antiderivative = 0.74 \[ \int x \sqrt {9+12 x+4 x^2} \, dx=\frac {2}{3} \, x^{3} \mathrm {sgn}\left (2 \, x + 3\right ) + \frac {3}{2} \, x^{2} \mathrm {sgn}\left (2 \, x + 3\right ) - \frac {9}{8} \, \mathrm {sgn}\left (2 \, x + 3\right ) \]
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Time = 0.03 (sec) , antiderivative size = 23, normalized size of antiderivative = 0.55 \[ \int x \sqrt {9+12 x+4 x^2} \, dx=\left (\frac {x^2}{3}+\frac {x}{4}-\frac {3}{8}\right )\,\sqrt {4\,x^2+12\,x+9} \]
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