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Rudik [331]
3 years ago
11

I’ll give brainliest, I need help with 9 and 10

Mathematics
1 answer:
Marysya12 [62]3 years ago
4 0

Answer:

9. \\-(2b-7a)(b+a)

10. mn(m^{2}-3mn+8n^{2} )

Step-by-step explanation:

9. -2b^{2} +5ab+7a^{2}\\

Write 5ab as a difference.

-2b^{2} -2ab+7ab+7a^{2}\\

Factor out the greatest common factor (GCFs).

-2b(b+a)+7a(b+a)\\\\-(2b-7a)(b+a)

10. -3m^{2} n^{2} +8mn^{3}+m^{3}n

Factor out the GCF which would be mn.

-mn(3mn-8n^{2}-m^{2}  )

Rewrite.

mn(m^{2}-3mn+8n^{2} )

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Let the number of copies that must be sold to break even be x, then
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let's firstly convert the mixed fractions to improper fractions and then add them up.

\bf \stackrel{mixed}{36\frac{4}{9}}\implies \cfrac{36\cdot 9+4}{9}\implies \stackrel{improper}{\cfrac{329}{9}} \\\\\\ \stackrel{mixed}{10\frac{2}{9}}\implies \cfrac{10\cdot 9+2}{9}\implies \stackrel{improper}{\cfrac{92}{9}}~\hfill \stackrel{mixed}{18\frac{2}{9}}\implies \cfrac{18\cdot 9+2}{9}\implies \stackrel{improper}{\cfrac{164}{9}} \\\\[-0.35em] ~\dotfill

\bf -\cfrac{329}{9}-\cfrac{92}{9}-\cfrac{164}{9}\implies \stackrel{\textit{using the LCD of 9}}{\cfrac{-329-92-164}{9}}\implies -\cfrac{585}{9}\implies -65

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Step-by-step explanation:

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Step-by-step explanation:

If this answer is correct, please make me Brainliest!

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