(a + b)*(b + c) + (b + 2.0*a)*(c - a)
(a + b)*(b + c) - (a - c)*(b + 2*a)
$$\left(a + b\right) \left(b + c\right) - \left(a - c\right) \left(2 a + b\right)$$
2 2
b - 2*a + 2*b*c + 3*a*c
$$- 2 a^{2} + 3 a c + b^{2} + 2 b c$$
2 2
b - 2*a + 2*b*c + 3*a*c
$$- 2 a^{2} + 3 a c + b^{2} + 2 b c$$