How do you solve this ? (-a) 5 + (-a)3 = ??? The book says the result is 8 but how do you get to that ?? (3 and 5 a 'to the power'.shoud be above right bracket but dont know how to write it)

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Originally Posted by Moondancer How do you solve this ? (-a) 5 + (-a)3 = ??? The book says the result is 8 but how do you get to that ?? (3 and 5 a 'to the power'.shoud be above right bracket but dont know how to write it)

Originally Posted by Moondancer How do you solve this ? (-a) 5 + (-a)3 = ??? The book says the result is 8 but how do you get to that ?? (3 and 5 a 'to the power'.shoud be above right bracket but dont know how to write it) "8" is wrong, unless there's a typo. First, we have that when n is odd. So: The only thing I can think of to do from here is to factor it: By the way, to type powers without using LaTeX, use (-a)^5, etc. -Dan

I agree with the others, there must be some mistake. I don't think we can get a "pure" number by solving .

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