If z is not equal to zero, and z=6zs−9s2−−−−−−−−√z=6zs−9s2, then z equals: Pick one:
A) s	B) 3s	C) 4s	D) -3s	E) -4s
squaring on both the sides gives Z^2 = 6ZS -9S^2   = Z^2-6ZS+9S^2   = Z(Z-3S) -3S(Z-3S)   = (Z-3S) (Z-3S)   = Z = 3S   Answer = 3s
<result>B</result>
If z is not equal to zero, and z=6zs−9s2−−−−−−−−√z=6zs−9s2, then z equals: