gracie wrote:
The first term of a sequence of consecutive positive even integers is equal to half the range. If the difference between the squares of the first and last terms is 512, what is the sum of the first and last terms?
A. 24
B. 28
C. 32
D. 40
E. 44
another approach:
let x and y=first and last terms
y=x+2x=3x
9x^2-x^2=512
8x^2=512
x^2=64
x=8
8+2*8=24
8+24=32
