book Maths Puzzle Numerical Ability

1/2x-1/2=1/4x+3/2

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If P=x+1/x-1 and Q=x-1/x+1, find P^2+Q^2-PQ. The kinetic energy of a particle of mass m is found by taking one-half of the product of the mass (m) and the square of the velocity (v). Write an expression for the kinetic energy