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# Help please (: watch

1. Expand :

n (2m+n) +5(n^2 + mn)

I expanded both pairs first then simplified it getting 5n^4 +7mn

That right ?
2. n^2 + 5n^2 =/= 5n^4
3. (Original post by cogman)
Expand :

n (2m+n) +5(n^2 + mn)

I expanded both pairs first then simplified it getting 5n^4 +7mn

That right ?

I'm pretty sure that
n (2m+n) +5(n^2 + mn)

= 2mn + n^2 + 5n^2 + 5mn
= 6n^2 + 7mn
4. 2mn + n^2 +5n^2 + 5mn

Sureley it should be 5n^2 and n^2 giving 5n^4

then 2mn + 5mn = 7mn

Giving 5n^4 +7mn ???
5. n(2m+n) + 5(n^2+mn)

=2mn + n^2 + 5n^2 + 5mn

collect the terms

=6n^2 + 7mn
6. (Original post by cogman)
2mn + n^2 +5n^2 + 5mn

Sureley it should be 5n^2 and n^2 giving 5n^4

then 2mn + 5mn = 7mn

Giving 5n^4 +7mn ???
You seem to have mistaken multiplication and addition. . The latter gives , but the former does not. Similarly, is not equal to .

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