Expand: [3a/2 + b/4 - 2c]2

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Taking LCM

Using identity, (a+b+c)² = a²+b²+c²+2ab+2bc+2ca

 ((6a)²+(b)²+(-8c)²+2*6a*b+2*b*(-8c)+2(-8c)*6a)

 (36a²+b²+64c²+12ab-16bc-96ac)