3.2.61 \(\int \frac {x}{a+b x} \, dx\) [161]

Optimal. Leaf size=18 \[ \frac {x}{b}-\frac {a \log (a+b x)}{b^2} \]

[Out]

x/b-a*ln(b*x+a)/b^2

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Rubi [A]
time = 0.01, antiderivative size = 18, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 1, integrand size = 9, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.111, Rules used = {45} \begin {gather*} \frac {x}{b}-\frac {a \log (a+b x)}{b^2} \end {gather*}

Antiderivative was successfully verified.

[In]

Int[x/(a + b*x),x]

[Out]

x/b - (a*Log[a + b*x])/b^2

Rule 45

Int[((a_.) + (b_.)*(x_))^(m_.)*((c_.) + (d_.)*(x_))^(n_.), x_Symbol] :> Int[ExpandIntegrand[(a + b*x)^m*(c + d
*x)^n, x], x] /; FreeQ[{a, b, c, d, n}, x] && NeQ[b*c - a*d, 0] && IGtQ[m, 0] && ( !IntegerQ[n] || (EqQ[c, 0]
&& LeQ[7*m + 4*n + 4, 0]) || LtQ[9*m + 5*(n + 1), 0] || GtQ[m + n + 2, 0])

Rubi steps

\begin {align*} \int \frac {x}{a+b x} \, dx &=\int \left (\frac {1}{b}-\frac {a}{b (a+b x)}\right ) \, dx\\ &=\frac {x}{b}-\frac {a \log (a+b x)}{b^2}\\ \end {align*}

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Mathematica [A]
time = 0.00, size = 18, normalized size = 1.00 \begin {gather*} \frac {x}{b}-\frac {a \log (a+b x)}{b^2} \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[x/(a + b*x),x]

[Out]

x/b - (a*Log[a + b*x])/b^2

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Maple [A]
time = 0.08, size = 19, normalized size = 1.06

method	result	size
default	\(\frac {x}{b}-\frac {a \ln \left (b x +a \right )}{b^{2}}\)	\(19\)
norman	\(\frac {x}{b}-\frac {a \ln \left (b x +a \right )}{b^{2}}\)	\(19\)
risch	\(\frac {x}{b}-\frac {a \ln \left (b x +a \right )}{b^{2}}\)	\(19\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x/(b*x+a),x,method=_RETURNVERBOSE)

[Out]

x/b-a*ln(b*x+a)/b^2

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Maxima [A]
time = 0.28, size = 18, normalized size = 1.00 \begin {gather*} \frac {x}{b} - \frac {a \log \left (b x + a\right )}{b^{2}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x/(b*x+a),x, algorithm="maxima")

[Out]

x/b - a*log(b*x + a)/b^2

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Fricas [A]
time = 0.93, size = 17, normalized size = 0.94 \begin {gather*} \frac {b x - a \log \left (b x + a\right )}{b^{2}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x/(b*x+a),x, algorithm="fricas")

[Out]

(b*x - a*log(b*x + a))/b^2

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Sympy [A]
time = 0.03, size = 14, normalized size = 0.78 \begin {gather*} - \frac {a \log {\left (a + b x \right )}}{b^{2}} + \frac {x}{b} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x/(b*x+a),x)

[Out]

-a*log(a + b*x)/b**2 + x/b

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Giac [A]
time = 0.80, size = 19, normalized size = 1.06 \begin {gather*} \frac {x}{b} - \frac {a \log \left ({\left | b x + a \right |}\right )}{b^{2}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x/(b*x+a),x, algorithm="giac")

[Out]

x/b - a*log(abs(b*x + a))/b^2

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Mupad [B]
time = 0.08, size = 18, normalized size = 1.00 \begin {gather*} -\frac {a\,\ln \left (a+b\,x\right )-b\,x}{b^2} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x/(a + b*x),x)

[Out]

-(a*log(a + b*x) - b*x)/b^2

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