(2a*4b)^2+(a*2b)^2+[b*(2c-3a)]^2
=64a^2*b^2+4a^2*b^2+(2bc-3ab)^2
=68a^2*b^2+4b^*2c^2+9a^2*b^2-12*a*b^2*c
=77a^2*b^2+4b^*2c^2-12*a*b^2*c
(2a*4b)^2+(a*2b)^2+[b*(2c-3a)]^2
=64a^2*b^2+4a^2*b^2+(2bc-3ab)^2
=68a^2*b^2+4b^*2c^2+9a^2*b^2-12*a*b^2*c
=77a^2*b^2+4b^*2c^2-12*a*b^2*c