Question

please tell the four important identities​

Answer 1

Identity - [i]

$\sf {(x + y)}^{2} = {x}^{2} + 2xy + {y}^{2}$

Identity - [ii]

$\sf {(x - y)}^{2} = {x}^{2} - 2xy + {y}^{2}$

Identity - [iii]

$\sf(x + y)(x - y) = {x}^{2} - {y}^{2}$

Identity - [iv]

$\sf(x + a)(x + b) = {x}^{2} + x(a + b) + ab$

Answer 2

Answer:

Standard Algebraic Identities List

☆ Identity I: (a + b)2 = a2 + 2ab + b2

☆ Identity III: a2 – b2= (a + b)(a – b)

☆Identity IV: (x + a)(x + b) = x2 + (a + b) x + ab.

☆ Identity V: (a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca.

☆ Identity VI: (a + b)3 = a3 + b3 + 3ab (a + b)

Step-by-step explanation:

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