(9x+ 8y) * (6x +3y) =
(9x+ 8y) * (6x +3y) = 54х² + 27ху + 48ху + 24у² = 54х² + 75ху + 24у²
54х^2+27ху+48ху+24у^2=54х^2+75ху+24у^2