Consider the given function:
=1.[(2x)6(−3)0]+6.[(2x)5(−3)]+15.[(2x)4(−302]
+20.[(2x)3(−3)2]+15.[(2x)2(−3)4]
+6.[(2x)(−3)5]+1.[(2x)0(−3)6]
=64x6−576x5+2160x4+4860x3−2916x+729
Hence this is the answer.