Question

x^3 + (2a+1)x^2 + (a^2+2a-1)x + (a^2-1)

Answer 1

\[x^3+(2a+1)x^2+(a^2+2a-1)x+(a^2-1)\]

Answer 2

Start Expanding the equation through removing the brackets:
\[x^3 + 2ax^2 + x^2 + a^2x + 2ax - x + a^2 -1\]
Then you add like terms together:
\[x^3 + a^3 + 2ax^2 + a^2x + 2ax + x^2 + a^2 - 1\]