makenzeemccarter makenzeemccarter

06-02-2020
Mathematics

contestada

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

Respuesta :

ryryw2003 ryryw2003

06-02-2020

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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