lizzy7631 lizzy7631

26-10-2014
Mathematics

Answered

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

Answer :

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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