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NemiM [27]
4 years ago
7

Simplify the expression (9 + 21)(9 – 21).

Mathematics
1 answer:
Serhud [2]4 years ago
8 0

Answer:

-360

Step-by-step explanation:

1. Add 9 + 21 and subtract 9 - 21

2. That would be (30)(-12)

3. Then multiply 30 x -12

4. You get -360

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