book Maths Puzzle Numerical Ability

find f(x) -g(x) when f(x) is x-1 and g(x) is 2x squared.

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book Other Question

The reciprocal of two more than a # is three times the reciprocal of the number. can some one please help me find the #?

Thanks A 78-in. board is to be cut into two pieces. One board must be twice as long as the other. How long should the shorter piece be?