book Maths Puzzle Numerical Ability

Can you please help to answer the following question:
.
For what values of A there are exactly two real numbers that satisfy the equation:
x^3 + (a-1)x^2 + (9-a)x - 9 = 0
Fin

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book Other Question

My question says to simplify the radical
(radical sign 6 - radical sign 5)(radical sign 6 + radical sign 5)
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