Factorise the following quadratic polynomials by splitting the middle term
$x^{2}+2 x-143$
$(x+13)(x-11)$
Write the coefficient of $x^{2}$ in the following polynomials
$\pi x^{2}-\frac{22}{7} x+3.14$
Which of the following expressions are polynomials in one variable and which are not $?$ State reason for your answer. If the given expression is a polynomial, state whether it is a polynomial in one variable or not
$x^{3}+y^{3}+z^{3}-3 x y z$
$\ldots \ldots$ is one of the zeros of $p(x)=x^{3}+7 x^{2}+11 x+5$
Factorise
$x^{3}+8 x^{2}+9 x-18$
$16 x^{2}+40 x y+25 y^{2}$
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