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b)4(1/2m-2)^2*m(m-8)=4(1/4m2+4-2m)*(m2-8m)=(m2+18-8m)( m2-8m)= m4-8m3+18m2-144m-8m3+64m2= m4-16m3+82m2=144m
c)(3x-5)^2-(5-3x)^2=(9x2+25-30x)-(25+9x2-30x)= 9x2+25-30x-25x-9x2+30x=0