Write the first three terms of a geometric sequence that has a first term of a = 7 and a common ratio, r, that satisfies r2 = 9.
r^2 = 9
r = 3 or -3
terms: 7 21 63 . . .
or: 7 -21 63 . . .
r = 3 or -3
terms: 7 21 63 . . .
or: 7 -21 63 . . .