Answer:
Step-by-step explanation:
you have to
first multiply the numbers you have in the column with the ones in the rows
8x* 5x = 40x² top left
8x* (-3) = -24x bottom left
-1 * 5x = -5x top right
-1* (-3) = 3 bottom right
second add and subtract all
40x²-24x-5x+3 = 40x²-29x+3
