Question

Calcular a soma dos onze primeiros termos da P.G (-1,4,-16...)

Answer 1

a1 = -1
q = -4

Sn = [a1 *(qⁿ - 1)] ÷ (q -1)
S11 = [-1 * (-4¹¹ - 1)] ÷ (-4 -1)
S11 = [-1 * (-4194304 - 1)] ÷ (-5)
S11 = [-1 * 4194305] ÷ (-5)
S11 = -4194305 ÷ (-5)
S11 = 838861