find each product and simplify if possible:
9z+5 X 5z
---- -----
15 81z(exponent 2) -25
try typing it like this:
(9z+5)/15 * 5z/(81z^2 - 25)
= (9z+5)/15 * 5z/[9z+5)(9z-5)]
= 1/3 * z/(9z-5) I canceled (9z+5) and a 5
= z/[3(9z-5), z not equal to zero or 5/9
check my steps, sometimes I make error when I am solving and typing at the same time.