Question

5c-4d/2c+3d*9d^2-4c^2/10c-8d

Answer 1

$frac{5c-4d}{2c+3d}* frac{9d^2-4c^2}{10c-8d}= frac{5c-4d}{2c+3d}* frac{(3d-2c)(3d+2c)}{2(5c-4d)}= frac{3d-2c}{2}$