All Identities of Polynomials Class 9 | Algebraic Identities of Polynomials | Class 9 maths

Описание: All Identities of Polynomials Class 9 | Algebraic Identities of Polynomials | Class 9 maths

Identities I to XI :

(a + b)² = a² + b² + 2ab

(a − b)² = a² + b² − 2ab

a² − b²= (a − b) (a + b)

(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)

a³+b³=(a+b)(a²+b²-ab)

a³-b³=(a-b)(a²+b²+ab)

(a+b+c)²=a²+b²+c²+2ab+2bc+2ca

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

if a+b+c=0
a³+b³+c³=3abc


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