From the following figure,find the number of real zeros of $y=p(x)$:

Draw the graph of $p(x) = 2x - 5$ and find the zeros of this polynomial.

Factorize the following polynomial: $p(x) = x^{3} - 4x^{2} + 5x - 20$.

Draw the graph of $p(x) = x^{2} + x - 12$ and find the zeros of this polynomial.

Find the zeroes of the following polynomial by the factorisation method and verify the relationship between the zeroes and the coefficients of the polynomial: $4x^2 - 3x - 1$

Find the value of $p(x) = 2x^3 + x^2 - x - 1$ at $x = 0$ and $x = -2$.