If $p(x)=x^{2}-4 x+3$ then, find the value of $p(2)-p(-1)+p\left(\frac{1}{2}\right)$

Expand the following:

$(3 a-2 b)^{3}$

Write the coefficient of $x^{2}$ in each of the following:

$(i)$ $\frac{\pi}{6} x+x^{2}-1$

$(ii)$ $3 x-5$

For the polynomial

$\frac{x^{3}+2 x+1}{5}-\frac{7}{2} x^{2}-x^{6},$ write

$(i)$ the degree of the polynomial

$(ii)$ the coefficient of $x^{3}$

$(iii)$ the coefficient of $x^{6}$

$(iv)$ the constant term

Write the coefficient of $x^{2}$ in each of the following:

$(i)$ $(x-1)(3 x-4)$

$(ii)$ $(2 x-5)\left(2 x^{2}-3 x+1\right)$

Classify the following as a constant, linear quadratic and cubic polynomials:

$2-x^{2}+x^{3}$