Cellular is an animation that helps you make geometric sequences composed of square cells.
Explore what happens when you draw graphs of quadratic equations
with coefficients based on a geometric sequence.
Watch the video to see how to sum the sequence. Can you adapt the method to sum other sequences?
You might need to ask your teacher to explain to you how to sum
a Geometric Progression.
Alternatively there are some ideas on the NRICH site- but this
diagram might give you some ideas: