Triangle ABC with segment BD where point D is between points C and A, BC equals x, BD equals y, CD equals w, DA equals z, and BA equals v

What expression represents the value of x?

x equals the square root of quantity w times the sum of w plus z end quantity
x equals the square root of quantity z times the sum of w plus z end quantity
x equals the square root of quantity w times y end quantity
x equals the square root of quantity w times z end quantity