Class 9 Mathematics Chapter 2 Introduction to Linear Polynomials – Revision Notes

Quick revision notes for Class 9 Maths Chapter 2 (Introduction to Linear Polynomials). These Class 9 Mathematics Chapter 2 notes are ideal for quick revision just before exams.

Polynomials

• Terms based on number of terms: monomial (1), binomial (2), trinomial (3).
• Degree = highest power of variable.
• Linear: degree 1; Quadratic: degree 2; Cubic: degree 3.

Zero of a Polynomial

• Value of x where p(x) = 0.
• Linear polynomial ax+b: unique zero x = −b/a.

Graph

• Linear polynomial y = ax+b → straight line; crosses x-axis at the zero.

One-Line Summary

A linear polynomial (degree 1) always has exactly one zero, found by solving ax+b=0, and its graph is always a straight line crossing the x-axis at that zero.

Written by Satish

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