Weegy: (2x + 3) (3x + 2) 6x^2 + 4x + 9x + 6 6x^2 + 13x + 6 User: Write the explicit formula for the geometric sequence.
a1 = -5 a2 = 20 a3 = -80 Weegy: The answer is C. an = -4(-5)n-1. User: What is the simplified form of the expression? (m^3/4c^5)^-4
Weegy: The answer for (m^3/4c^5)^-4 is (256 c^20)/m^12 User: Simplify the expression. 3/a^-9^b Weegy: It's 9. (More)

The explicit formula for the geometric sequence a1 = -5 a2 = 20 a3 = -80 is a(n) = a(1)*r^(n - 1) where r is the common ratio -4. So, a(n) = -5(-4)^(n -1)

Added 4/7/2014 6:30:00 AM

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