3 years ago

This is now day two of finding kiyah McCain, I miss you ki :(

Mathematics

1 answer:

jolli1 [7]3 years ago

7 0

Where is the question

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What’s is the sum of the series?

STALIN [3.7K]

Answer:

Step-by-step explanation:

$\sum\limits_{k=1}^4(2k^2-4)\to a_k=2k^2-4\\\\for\ k=1:\\\\a_1=2(1)^2-4=2(1)-4=2-4=-2\\\\for\ k=2:\\\\a_2=2(2)^2-4=2(4)-4=8-4=4\\\\for\ k=3:\\\\a_3=2(3)^2-4=2(9)-4=18-4=14\\\\for\ k=4:\\\\a_4=2(4)^2-4=2(16)-4=32-4=28\\\\\sum\limits_{k=1}^4(2k^2-4)=-2+4+14+28=44$

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3 years ago

Solve 8x + c = k for x.

alex41 [277]

Answer: $x=\frac{c-k}{8}$

Step-by-step explanation:

$1) \text { } 8x+c=k \text{ (given)}\\\\2) \text { }8x=c-k \text{ (subtract } k \text{ from both sides)}\\\\3) \text { } \boxed{x=\frac{c-k}{8}} \text{ (divide both sides by 8)}$