book Maths Puzzle Numerical Ability

I need help!



2) Use the geometric sequence of numbers 1, 2, 4, 8,…to find the following:
a) What is r, the ratio between 2 consecutive terms?
Answer:
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book Other Question

Multiply by the vertical method..

(m^2) - 5mn + 3n^2) (m^2+4mn-2n^2)
I need to solve the formula in terms of the given variable ad = f;a

I have no idea what to do, please help!