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

User Coincoin
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2 Answers

3 votes

m^2n-3mn^2=mn(m-3n)=5\cdot 8=40
User Yoshua Wuyts
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8.6k points
1 vote
= (m^2)n -3m(n^2). Factorise.

=mn( m-3n) : Recall mn = 5. (m-3n) =8.

Substituting:
=mn( m-3n)
= 5*(8) = 40.

Cheers.

User Jordan Stefanelli
by
8.4k points
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