a^2+b(b+1)a+b^3

Hmmmm I think this can also be factorised. . .

$$a^2+ab^2+ab+b^3$$

$$a(a+b^2)b(a+b^2)$$

$$(a+b)(a+b^2)$$

:)

$$\\a^2+b(b+1)a+b^3\\
a^2+ab(b+1)+b^3\\
a^2+ab^2+ab+b^3\\$$

Thanks Zac