Let TU and VW be chords of a circle, which intersect at S, as shown. If ST=3,TU=15 , and VW=3, then find SW .

I tried using power of a point and I got 18 but it was not correct fsr... .-.

ST * SU = SV * SW solve for SV using quadratic formula

Let SV be x

x (x + 3) = 3 * 18

x^{2} + 3x - 54 = 0 (solve with the quadratic formula)

x = 6

SW = 9