Find the squares of the following numbers using the identity `(a-b)^2=a^2-2a b+b^2` (I)491 (ii) 189 (iii) 575

Explanation

To find the squares of the given numbers using the identity \((a-b)^2 = a^2 - 2ab + b^2\), we will break down each number into a suitable form.

### (I) Finding the square of 491

1. **Choose \(a\) and \(b\)**: We can express 491 as \(500 - 9\). Here, \(a = 500\) and \(b = 9\).

2. **Apply the identity**:
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