Question

all identities of all chapters of maths class 9​

Answer 1

Step-by-step explanation:

#All Algebraic identities------

◆(x + y)2 = x2 + 2xy + y2

◆(x – y)2 = x2 – 2xy + y2

◆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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