( 4 a b2 ) x ( 2 a b ) = 8 a2 b3
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Assuming that non-leading numbers are exponents, the expression becomes12a^2b + 8a - 5a^2b + 2ab - 4ab^2 + 6ab - 2a - 3ab= 7a^2b + 6a + 5ab - 4ab^2= a*(7ab + 6 + 5b - 4b^2)
it usually starts with x=.... ex: for foil method , which is (a+b)2 would be x=a2+2ab+b2
a^2 + b^2 + 2ab = (a + b)^2
x=ab
b/2=2ab/+b means112.5