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02-08-2021
Mathematics

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Find the sum of ∑4/k=1 (-4k)

Find the sum of 4k1 4k class=

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02-08-2021

Answer:

Hello,

Answer C: -40

Step-by-step explanation:

[tex]\displaystyle \sum_{k=1}^4\ (-4k)\\\\=-4*\sum_{k=1}^4\ k\\\\=-4*4*\dfrac{1+4}{2} \\\\=-4*5*2\\\\=-40\\[/tex]

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