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damaskus [11]
3 years ago
9

Pls help me it's due today​

Mathematics
1 answer:
Dimas [21]3 years ago
8 0

Answer:

r³ + 15r² - 10r - 4

Step-by-step explanation:

First, note you can remove the brackets, in this case they contribute nothing at all.

Then, group the like terms and add them, e.g., we have 3r³ and -2r², they add up to r³.

Finally, order them from greatest power of r to smallest power of r.

That's all!

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