State whether each of the following statements is true or false

The zero of polynomial $2 x+3$ is $\frac{3}{2}$.

Using suitable identity, evaluate the following:

$999^{2}$

Factorise

$6 x^{3}+7 x^{2}-14 x-15$

From the following polynomials find out which of them has $(x+1)$ as a factor

$6 x^{3}+11 x^{2}-5 x-12$

Factorise the following quadratic polynomials by splitting the middle term

$x^{2}+2 x-143$