SOLUTION: how to simplify this eqaution? (-7x3) (20x9)

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Question 146510: how to simplify this eqaution?
(-7x3) (20x9)
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
%28-7x%5E3%29%2A%2820x%5E9%29 Start with the given expression.


-140x%5E3+x%5E9 Multiply the coefficients -7 and 20 to get -140


-140x%5E%283%2B9%29 When you multiply monomials, simply add the exponents.


-140x%5E12 Add.


So %28-7x%5E3%29%2A%2820x%5E9%29=-140x%5E12.