B1:
A = \(\left(2x+1\right)^2+2\left(4x^2-1\right)+\left(2x-1\right)^2\)
A = \(4x^2+4x+1+8x^2-2+4x^2-4x+1\)
A = \(16x^2\)
B = \(x\left(x-4\right)\left(x+4\right)-\left(x^2+1\right)\left(x^2-1\right)\)
B = \(x\left(x^2-16\right)-x^4+1\)
B = \(x^3-16x-x^4+1\)
C = \(\left(x^2-1\right)\left(x-3\right)-\left(x-3\right)\left(x^2+3x+9\right)\)
C = \(x^3-3x^2-x+3-x^3+27\)
C = \(-3x^2-x+30\)