Expand the series and evaluate:
Enter your answer as the following example: -1-2-3-4-5-6=-21
sum_(k=5)^10(-5k)

Question

amistre64 · Answer

whats your best effort give us?

amistre64 · Answer

seeing this done a few times should give you an idea that we can build upon

anonymous · Answer

Ok @amistre64, please leave me alone

amistre64 · Answer

ok, but good luck with it all :)

anonymous · Answer

Can someone help me please?

amistre64 · Answer

im willing to help, but ....

anonymous · Answer

But what?

amistre64 · Answer

you said you dont want me to help you

anonymous · Answer

I want help I just don't want to be criticized

amistre64 · Answer

noones criticizing you.  I just need to know how much you know on this subject.

amistre64 · Answer

does the notation make sense for starters.

amistre64 · Answer

$$\sum_{k=5}^{10}$$is a good place to start

anonymous · Answer

I know nothing

amistre64 · Answer

then this might take a bit.  It is simple enough tho.

the symbol: $\sum$ is a greek letter for "S" and indicated that we are going to be adding up stuff

amistre64 · Answer

the number on the bottom tells us where we start at; and the number on top tells us where we end at:  in this case we start with k=5 and end with k=10

anonymous · Answer

ok

amistre64 · Answer

i like to write it out to begin with like this:

  k : rule
-------
 5 : -5k = -5(5) = -25
 6 : -5k = -5(6) = -30
 7 : -5k = -5(7) = -35
 8 : -5k = -5(8) = -40
 9 : -5k = -5(9) = -45
10: -5k = -5(10)= -50

does this make sense so far?

amistre64 · Answer

$$\sum_{First}^{Last}(rule)$$
using the rule, and stepping thru the numbers from first to last, we can generate all the numbers that are needed to be added up.