lizzy7631 lizzy7631
  • 26-10-2014
  • Mathematics
Answered

If mn=5 and m-3n=8, what is m^2n-3mn^2?

Answer :

konrad509
konrad509 konrad509
  • 26-10-2014
[tex]m^2n-3mn^2=mn(m-3n)=5\cdot 8=40[/tex]
Answer Link
olemakpadu
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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