book Maths Puzzle Numerical Ability

show how to solve (1+h)(1+h)(1+h)

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I have looked in so many places to find a solution or method for this, and I have not succeeded. I would appreciate some help!

f(x) = 0

f(x) = x^2 + 2x - 1 Is the formula used to figure out the cube of a carton - length x width x height divided by 1726?