add, simplify if possible.
z+r/zr^2 + 8z+r/z^2r
Find a common denominator:
(z(z + r) + r(8z + r)) / z^2r^2,
(z^2 + rz +8rz + r^2) / z^2r^2,
Combine like-terms:
(z^2 + 9rz + r^2) / z^2r^2
z+r/zr^2 + 8z+r/z^2r
(z(z + r) + r(8z + r)) / z^2r^2,
(z^2 + rz +8rz + r^2) / z^2r^2,
Combine like-terms:
(z^2 + 9rz + r^2) / z^2r^2