(4с+1/4)(4с-1/4)+(4с-1/4x)^2 при с=1/2 х=2

Question

(4с+1/4)(4с-1/4)+(4с-1/4x)^2 при с=1/2 х=2

Answer 1

=16с²-1/16+16c²-2x+1/16x²=32c²-2x
32*(1/2)²-2*2=32*1/4-2*2=8-4=4