Question

Write the terms of the series and find their sum

Answer 1

\[\sum_{k=1}^{4} (k+9)^{2}\]

Answer 2

replace \(k\) by \(1\) get \((1+9)^2=10^2=100\)

Answer 3

then replace \(k\) by \(2\) and get \((2+9)^2=11^2=121\)
then replace \(k\) by \(3\)
and finally replace \(k\) by \(4\)
then add up all your answers

Answer 4

add up the 100, 121, etc?

Answer 5

100, 121, 144, 169 =534?