If x is a number such that x^2 + 3x - 10 = 0 and x^2 + x - 20 = 0, then x =  Choose the correct choice from the following.
A) 2 B) 4 C) -4 D) 5 E) -5
x^2 + 3x - 10 = (x+5)(x-2) = 0   Then x=-5 or x=2.   x^2 + x - 20 = (x-4)(x+5) = 0   Then x=4 or x=-5.   Thus x=-5.   The answer is -5.
<result>E</result>
If x is a number such that x^2 + 3x - 10 = 0 and x^2 + x - 20 = 0, then x =