# Algebra Formulas for Class 9

In algebra, a branch of mathematics, quantities, and numbers are represented by generic symbols and letters in equations and formulas.

Algebra is divided into two sections: Elementary and Modern algebra (Abstract algebra). There are formulas for algebra identities and expressions in the class 9 textbook.

In CBSE class 9, the chapter on algebraic identities is introduced. This is a challenging chapter where you must memorize and use all formulas appropriately.

## List of Algebra Formulas Class 9

This list of algebra formulae for class 9 can be used to solve various algebraic equations.

a2 – b2 = (a – b)(a + b)

(a + b)2 = a2 + 2ab + b2

a2 + b2 = (a + b)2 – 2ab.

(a – b)2 = a2 – 2ab + b2

(a + b)3 = a3 + b3 + 3ab(a + b)

(a – b)3 = a3 – b3 – 3ab(a – b)

a3 – b3 = (a – b)(a2 + ab + b2)

a3 + b3 = (a + b)(a2 – ab + b2)

x(a + b) = xa + xb

x(a – b) = xa – xb

(x – a)(x – b) = x2 – (a + b)x + ab

(x – a)(x + b) = x2 + (b – a)x – ab

(x + a)(x – b)= x2 + (a – b)x – ab

(x + a)(x + b)= x2 + (a + b)x + ab

(x + y + z)2 = x2 + y2 + z2 + 2xy + 2yz + 2zx

(x – y – z)2 = x2 + y2 + z2 – 2xy + 2yz – 2zx

Algebra Formulas for Class 8

Perfect Square Formula