Let a and b be the roots of x^2 - 23x + 47 = 0. Compute (a - 1)(b - 1).
( from Quadratic Formula)
𝑥=23/2±Sqrt (341) / 2 You can do the rest
NO! Don't do that @ElectricPavlov!
The product of the roots is 47/1=47, and the sum of the roots is 23/1=23. So the answer is 47-23+1=25.