lizzy7631
lizzy7631
26-10-2014
Mathematics
contestada
If mn=5 and m-3n=8, what is m^2n-3mn^2?
Respuesta :
konrad509
konrad509
26-10-2014
[tex]m^2n-3mn^2=mn(m-3n)=5\cdot 8=40[/tex]
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olemakpadu
olemakpadu
26-10-2014
= (m^2)n -3m(n^2). Factorise.
=mn( m-3n) : Recall mn = 5. (m-3n) =8.
Substituting:
=mn( m-3n)
= 5*(8) = 40.
Cheers.
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