If x is a number such that x^2 + 4x - 5 = 0 and x^2 - 5x + 4 = 0, then x =	Choose the correct choice from the following answers.
A) 5
B) 4
C) 1
D) -4
E) -5
x^2 + 4x - 5 = (x+5)(x-1) = 0   Then x=-5 or x=1.   x^2 - 5x + 4 = (x-4)(x-1) = 0   Then x=4 or x=1.   Thus x=1.   The answer is 1.
<result>C</result>
If x is a number such that x^2 + 4x - 5 = 0 and x^2 - 5x + 4 = 0, then x =