Respuesta :
The common ratio tells you by which factor every successive term will be with respect to the preceding term so you have:
-2(-1/4)(-1/4)(-1/4)
1/2, -1/8, 1/32
-2(-1/4)(-1/4)(-1/4)
1/2, -1/8, 1/32
[tex]a_1=-2\\
a_2=-2\cdot\left(-\dfrac{1}{4}\right)=\dfrac{1}{2}\\
a_3=-2\cdot\left(-\dfrac{1}{4}\right)^2=-\dfrac{1}{8}\\
a_4=-2\cdot\left(-\dfrac{1}{4}\right)^3=\dfrac{1}{32}[/tex]