Tuesday, 13 July 2021

Class 9 Maths - Important Identities (#class9Maths)(#eduvictors)

Class 9 Maths - Important Identities

Class 9 Maths - Important Identities (#class9Maths)(#eduvictors)


(a+b)² = a² + 2ab+ b²


(a–b)² = a² –2ab + b²


a² – b² = (a+b)(a–b)


(x+a)(x+b) = x²  + (a+b)x + ab


(a+b+c)² = a² +b² +c² + 2ab + 2bc + 2ca


(a+b)³ =a³ + b³ + 3ab(a+b)


(a–b)³ =a³ – b³ – 3ab(a–b)


a³ +b³ +c³ – 3abc = (a+b+c)(a² +b² +c² –ab –bc –ca)


(a+b)⁴ = a⁴ + 4a³b + 6a²b² +4ab³ + b⁴


a² –b² =(a+b)(a–b)


a³ –b³ =(a–b)(a² + ab + b²)


a³ + b³ = (a+b)(a² –ab + b²)


a⁴ –b⁴ = (a² –b²)(a² +b²)


👉See Also:

Maths Resources

Maths Symbols

Special Constants

NCERT Polynomials - Exercise 2.1
Polynomials - Exercise 2.2 (NCERT)
Polynomials - Exercise 2.3 (NCERT)
Polynomials - Exercise 2.4 (NCERT) 
Polynomials - Exercise 2.5 (NCERT) + Exercise 4.1(R D Sharma)
Polynomials (Important Points To Remember)


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