Question

All the 8 algebraic identities of class 9( Ch2, POLYNOMIALS)
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Answer 1

Heya!!

Here is your answer -

1. (x + y)^2 = x^2 + 2xy + y^2
2. (x – y)^2 = x^2 – 2xy + y^2
3. x^2 – y^2 = (x + y) (x – y)
4. (x + a) (x + b) = x^2 + (a + b)x + ab.
5. (x + y + z)^2 = x^2 + y^2 + z^2 + 2xy + 2yz + 2zx.
6. (x + y)^3 = x^3 + y^3 + 3xy(x + y)
7. (x – y)^3 = x^3 – y^3 – 3xy(x – y)
8. x^3 + y^3 + z^3 – 3xyz = (x + y + z) (x^2 + y^2 + z^2 – xy – yz – zx)

Answer 2

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