单选题If (x-1) 2-(x-1) = 0, then, ______.Ax = 0 or x = 2Bx = 0 or x = 1Cx =-1 or x = 2Dx = 1 or x = 2Ex = 0 or x =-1

单选题
If (x-1) 2-(x-1) = 0, then, ______.
A

x = 0 or x = 2

B

x = 0 or x = 1

C

x =-1 or x = 2

D

x = 1 or x = 2

E

x = 0 or x =-1


参考解析

解析:
Solution 1: If(x-1) 2 -(x-1) = 0, then factoring the left side of the equation gives (x- 1) [(x-1)-1] = 0 which simplifies to (x-1)(x-2) = 0. Hence, x may be equal to 1 or 2. Solution 2: Substitute the pair of values in each of the answer choices into the given equation, (x-1) 2 -(x -1) = 0, until you find a pair, x = 1 or x = 2, that works.

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