Bisection of chord of parabola $y=-a^2x^2+5ax-4$

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The chord of a parabola $y=-a^2x^2+5ax-4$ touches the curve $y=\frac{1}{1-x}$ and is bisected by that point. Find the value of $a$.

What do this question mean by bisected by that point? Could someone help me with this?

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It means that the chord of the parabola is tangent to the curve $y = 1/(1-x)$, and the point of tangency is the midpoint of the chord.