The potential energy for a conservative force system is given by `U=ax^(2)-bx`. Where a and b are constants find out (a) The expression of force (b) Potential energy at equilibrium.

Explanation

To solve the problem step by step, we will find the expression for the force and then determine the potential energy at equilibrium.

### Step 1: Find the expression for force
The potential energy \( U \) is given by the equation:
\[ U = ax^2 - bx \]
where \( a \) and \( b \) are constants.
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