Well
By what i can guess with your representation
you want (x-2x)^2
=x^2+4x^2-4x^2=x^2
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92.3 is in expanded form.
2.145 = 2 + 0.1 + 0.04 + 0.005 in expanded form
The expanded form of 42.28 is 40 + 2 + 0.2 + 0.08.
what are the coefficient of this number -8a+2=13
The expanded form of 4.067 is, 4+(6x10-2)+(7x10-3)