RRB Group D Polynomials

A polynomial in one variable x looks like: ax^n + bx^(n-1) + ... + cx + d, where a, b, c, d are constants (called coefficients) and n is a whole number (called the degree). For example, 3x² + 5x + 2 is a polynomial of degree 2

The DEGREE is the highest power of the variable. In 4x³ + 2x + 1, degree = 3. 2. The LEADING COEFFICIENT is the coefficient of the highest degree term. In 4x³ + 2x + 1, leading coefficient = 4. 3.

The CONSTANT TERM is the term without any variable. In 4x³ + 2x + 1, constant = 1. 4. A polynomial can have multiple variables: 3x²y + 2xy + 5 is valid. 5

If polynomial P(x) is divided by (x - a), the remainder equals P(a). 6

(x - a) is a factor of P(x) if and only if P(a) = 0.

- Finding remainders using Remainder Theorem - Identifying if an expression is a polynomial - Finding the degree and coefficients - Factorizing polynomials - Finding roots/zeros of polynomials SHORTCUT: To find remainder when P(x) is divided by (x - a): Simply substitute x = a in P(x). Don't do actual division

P(x) = x² + 3x + 2 divided by (x - 1). Remainder = P(1) = 1 + 3 + 2 = 6.