At 8 o'clock, cars start from A to B at 40 km / h. At the same time, a motorbike comes from B to A with a speed of 45 km. After three hours the two vehicles met each other to ask how long AB kilometers were

For G = 5xy + xy² - 6x²y + 9

      H = 5x²y - 7xy + 3xy² - 5

The provincail : H - G ; G + H 

Help me ! Love ............ help I

For : G = 3x²y + 2xy - 2xy² + 4

         M = 4xy - 3x²y + 3xy² - 7

The provincial  : -M - G ; -G - M