If x is a number such that x^2 + 4x - 5 = 0 and x^2 + x - 20 = 0, then x =  Choose the correct choice from the following choices.
A) 1  B) -4  C) 4  D) -5  E) 5
x^2 + 4x - 5 = (x+5)(x-1) = 0   Then x=-5 or x=1.   x^2 + x - 20 = (x-4)(x+5) = 0   Then x=4 or x=-5.   Thus x=-5.   The answer is -5.
<result>D</result>
If x is a number such that x^2 + 4x - 5 = 0 and x^2 + x - 20 = 0, then x =