William

10-28-2013, 04:56 PM

If x^2-2x+1=0 , which of the following is the value of x-1?

(A) 0

(B) 1

(C) 2

(D) 3

Thanks!

(A) 0

(B) 1

(C) 2

(D) 3

Thanks!

View Full Version : sat math question

William

10-28-2013, 04:56 PM

If x^2-2x+1=0 , which of the following is the value of x-1?

(A) 0

(B) 1

(C) 2

(D) 3

Thanks!

(A) 0

(B) 1

(C) 2

(D) 3

Thanks!

Thomas

10-28-2013, 04:56 PM

First solve the quadratic equation

x^2-2x+1=0 \Rightarrow (x-1)^2=0 \Rightarrow x=1

and then plug in this value to the expression x-1=1-1=0

Therefore the correct answer is (A).

x^2-2x+1=0 \Rightarrow (x-1)^2=0 \Rightarrow x=1

and then plug in this value to the expression x-1=1-1=0

Therefore the correct answer is (A).

William

10-28-2013, 04:56 PM

First solve the quadratic equation

x^2-2x+1=0 \Rightarrow (x-1)^2=0 \Rightarrow x=1

and then plug in this value to the expression x-1=1-1=0

Therefore the correct answer is (A).

Thank you!

x^2-2x+1=0 \Rightarrow (x-1)^2=0 \Rightarrow x=1

and then plug in this value to the expression x-1=1-1=0

Therefore the correct answer is (A).

Thank you!

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