CBSE Class 7 Answered
please explain me that what is an identity of an equation
Asked by amu_bgr | 09 May, 2019, 11:41: AM
Expert Answer
An identity is an equality relation, X = Y is identically equal where X & Y contain some variables.
Example:
(a + b)2 = a2 + 2ab + b2
Here X = (a + b)2 and Y = a2 + 2ab + b2
Put a = 1 and b = 2 in X and Y
So, X = (1 + 2)2 = 32 = 9
Y = a2 + 2ab + b2 = (1)2 + 2(1)(2) + (2)2 = 1 + 4 + 4 = 9
→ X = Y
For any value of a and b, (a + b)2 = a2 + 2ab + b2 is true.
→(a + b)2 = a2 + 2ab + b2 is an identity.
Answered by Yasmeen Khan | 09 May, 2019, 12:44: PM
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