-(5/4)^3+4(1/8-3/4)^2

-(5/4)^3+4(1/8-3/4)^2  =

-(125/64) + 4 (1/8 - 6/8)^2  =

-(125/64)  +  4 (-5/8)^2  =

-(125/64) + 4 (2564)  =

-125/64   +  100/64  =

-25/64