check page 93 of textbook for proof.
utlity function U(x1,x2) = x1x2 is a cobb douglas utility function.
check if your notes have it, cobb douglas relies on some assumptions i suppose.
x1^a x2^b where 'a' and 'b' are random numbers.
optimal choice for x1 = a/(a+b) * m/p1. in this case a = 1 b=...