Question

All identities of chapter 2 of class 9 the in ncert book...

Answer 1

Answer:

(x+y)²= x²+y²+2xy

(x-y)²=x²+y²-2xy

x²-y²=(x+y)(x-y)

(x+a)(x+b)=x²+(a+b)x ab

(x+y+z)²= x²+y²+z²+2xy+2yz+2zx

(x+y)³= x³+y³+3xy(x+y)

(x-y)³=x³-y³-3xy(x-y)

x³+y³+z³-3xyz=(x+y+z)(x²+y²+z²-xy-yz-zx)

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Answer 2

(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+c)²=a²+b²+c²+2ab+2bc+2ca

(a+b)³=a³+b³+3xy(a+b)

(a-b)³=a³-b³-3xy(a-b)

a³+b³+c³-3abc=(a+b+c) (a²+b²+ç²-ab-bc-ca)

a³-b³=(a-b) (a²+b²+2ab)