Question 38653
Any time straight lines cross, they make congruent vertical angles.
Thus x^2 = x + 20
x^2 - x - 20 = 0
(x - 5)(x + 4) = 0
x = 5  (x cannot be negative)
and if x = 5, the two angles are
x^2 = 25 and
x + 20 = 25