# Algebraic Identities For Class 9

Algebra is a part of Mathematics in which general symbols and letters are used to represent quantities and numbers in equations and formulae. There are two parts in algebra – Elementary algebra and Modern algebra (Abstract algebra). Algebra formulas for class 9 include formulas related to algebra identities or expressions.

Algebra Identities chapter is introduced in CBSE class 9. This is a little tricky chapter where one needs to learn all the formula and apply them accordingly. To make easy for them, we at Byju’s provide all the formulas on a single page. We believe, algebra formulas for class 9 will help students to score better marks in mathematics.

Algebra Formulas List is given below. Have a look at it.

 Algebraic Identities For Class 9 (a+b)2=a2+2ab+b2 (a−b)2=a2−2ab+b2 (a+b)(a–b)=a2–b2 (x+a)(x+b)=x2+(a+b)x+ab (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 (a+b)3=a3+b3+3ab(a+b) (a–b)3=a3–b3–3ab(a–b) (x+y+z)2=x2+y2+z2+2xy+2yz+2xz (x+y–z)2=x2+y2+z2+2xy–2yz–2xz (x–y+z)2=x2+y2+z2–2xy–2yz+2xz (x–y–z)2=x2+y2+z2–2xy+2yz–2xz x3+y3+z3–3xyz=(x+y+z)(x2+y2+z2–xy–yz−xz x2+y2=1/2[(x+y)2+(x–y)2] (x+a)(x+b)(x+c)=x3+(a+b+c)x2+(ab+bc+ca)x+abc x3+y3=(x+y)(x2–xy+y2) x3–y3=(x–y)(x2+xy+y2) x2+y2+z2−xy–yz–zx=1/2[(x−y)2+(y−z)2+(z−x)2]