Answer:
a^2-ab-2b^2
Step-by-step explanation:
It may look complicated at first sight but Its actually very simple by using a strategy called FOIL which stands for
F-front ,a*a=a^2
O-outside,a*-2b=-2ab
I-inside,a*b=ab
L-last ,-2b*b=-2b^2
so the answer would be a^2-2ab+ab-2b^2,or can be simplified as
a^2-ab-2b^2
