If fn = (n+ 1)^2, what is the sum of the first four values of n, n = 1, 2, 3, and 4?

Answer 1

f₁=(1+1)²=4

f₂=(2+1)²=9

f₃=(3+1)²=16

f₄=(4+1)²=25

4+9+16+25=54