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Differentiate w.r.t. k
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\frac{-15k^{2}}{15\left(k+3\right)k^{2}}
Factor the expressions that are not already factored.
\frac{-1}{k+3}
Cancel out 15k^{2} in both numerator and denominator.
\frac{\left(15k^{3}+45k^{2}\right)\frac{\mathrm{d}}{\mathrm{d}k}(-15k^{2})-\left(-15k^{2}\frac{\mathrm{d}}{\mathrm{d}k}(15k^{3}+45k^{2})\right)}{\left(15k^{3}+45k^{2}\right)^{2}}
For any two differentiable functions, the derivative of the quotient of two functions is the denominator times the derivative of the numerator minus the numerator times the derivative of the denominator, all divided by the denominator squared.
\frac{\left(15k^{3}+45k^{2}\right)\times 2\left(-15\right)k^{2-1}-\left(-15k^{2}\left(3\times 15k^{3-1}+2\times 45k^{2-1}\right)\right)}{\left(15k^{3}+45k^{2}\right)^{2}}
The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is 0. The derivative of ax^{n} is nax^{n-1}.
\frac{\left(15k^{3}+45k^{2}\right)\left(-30\right)k^{1}-\left(-15k^{2}\left(45k^{2}+90k^{1}\right)\right)}{\left(15k^{3}+45k^{2}\right)^{2}}
Simplify.
\frac{15k^{3}\left(-30\right)k^{1}+45k^{2}\left(-30\right)k^{1}-\left(-15k^{2}\left(45k^{2}+90k^{1}\right)\right)}{\left(15k^{3}+45k^{2}\right)^{2}}
Multiply 15k^{3}+45k^{2} times -30k^{1}.
\frac{15k^{3}\left(-30\right)k^{1}+45k^{2}\left(-30\right)k^{1}-\left(-15k^{2}\times 45k^{2}-15k^{2}\times 90k^{1}\right)}{\left(15k^{3}+45k^{2}\right)^{2}}
Multiply -15k^{2} times 45k^{2}+90k^{1}.
\frac{15\left(-30\right)k^{3+1}+45\left(-30\right)k^{2+1}-\left(-15\times 45k^{2+2}-15\times 90k^{2+1}\right)}{\left(15k^{3}+45k^{2}\right)^{2}}
To multiply powers of the same base, add their exponents.
\frac{-450k^{4}-1350k^{3}-\left(-675k^{4}-1350k^{3}\right)}{\left(15k^{3}+45k^{2}\right)^{2}}
Simplify.
\frac{225k^{4}-9k^{2}}{\left(15k^{3}+45k^{2}\right)^{2}}
Combine like terms.