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\left(10n+2\right)\left(4n-\frac{4}{5}\right)
Use the distributive property to multiply 2 by 5n+1.
40n^{2}+10n\left(-\frac{4}{5}\right)+8n+2\left(-\frac{4}{5}\right)
Apply the distributive property by multiplying each term of 10n+2 by each term of 4n-\frac{4}{5}.
40n^{2}+\frac{10\left(-4\right)}{5}n+8n+2\left(-\frac{4}{5}\right)
Express 10\left(-\frac{4}{5}\right) as a single fraction.
40n^{2}+\frac{-40}{5}n+8n+2\left(-\frac{4}{5}\right)
Multiply 10 and -4 to get -40.
40n^{2}-8n+8n+2\left(-\frac{4}{5}\right)
Divide -40 by 5 to get -8.
40n^{2}+2\left(-\frac{4}{5}\right)
Combine -8n and 8n to get 0.
40n^{2}+\frac{2\left(-4\right)}{5}
Express 2\left(-\frac{4}{5}\right) as a single fraction.
40n^{2}+\frac{-8}{5}
Multiply 2 and -4 to get -8.
40n^{2}-\frac{8}{5}
Fraction \frac{-8}{5} can be rewritten as -\frac{8}{5} by extracting the negative sign.
\left(10n+2\right)\left(4n-\frac{4}{5}\right)
Use the distributive property to multiply 2 by 5n+1.
40n^{2}+10n\left(-\frac{4}{5}\right)+8n+2\left(-\frac{4}{5}\right)
Apply the distributive property by multiplying each term of 10n+2 by each term of 4n-\frac{4}{5}.
40n^{2}+\frac{10\left(-4\right)}{5}n+8n+2\left(-\frac{4}{5}\right)
Express 10\left(-\frac{4}{5}\right) as a single fraction.
40n^{2}+\frac{-40}{5}n+8n+2\left(-\frac{4}{5}\right)
Multiply 10 and -4 to get -40.
40n^{2}-8n+8n+2\left(-\frac{4}{5}\right)
Divide -40 by 5 to get -8.
40n^{2}+2\left(-\frac{4}{5}\right)
Combine -8n and 8n to get 0.
40n^{2}+\frac{2\left(-4\right)}{5}
Express 2\left(-\frac{4}{5}\right) as a single fraction.
40n^{2}+\frac{-8}{5}
Multiply 2 and -4 to get -8.
40n^{2}-\frac{8}{5}
Fraction \frac{-8}{5} can be rewritten as -\frac{8}{5} by extracting the negative sign.