Blue book pg 681 # 7

Celita
Thu, 22 Nov 2007 13:37:00 +0000

For some reason I don’t understand this one… argh.

If a and b are positive integers and a^2 - b^2 = 7, what is the value of a?

A. 3
B. 4
C. 5
D. 6
E. 7

Eh.