The graph of a linear polynomial $y=p(x)$ passes through the marked points P and Q (1 square = 1 unit). What is the zero of $p(x)$?

By number of terms:
- **Monomial**: 1 term (e.g. $5x^3$)
- **Binomial**: 2 terms (e.g. $x^2+3$)
- **Trinomial**: 3 terms (e.g. $x^2+2x+1$)

By degree:
- **Linear** (degree 1): $3x-5$
- **Quadratic** (degree 2): $x^2-4$
- **Cubic** (degree 3): $2x^3+x-1$
- **Biquadratic** (degree 4): $x^4+1$

A polynomial can fit multiple categories. $5x^3$ is both a monomial and a cubic.