Using the identity (a+1)² = a² + 2a + 1, 126² = 125² + 2×125 + 1 = 15625 + 250 + 1 = 15625 + 251. So, the correct option is (iv) 15625 + 251. Class 8 NCERT Ganita Prakash ...
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Using the identity (a+1)² = a² + 2a + 1, 126² = 125² + 2×125 + 1 = 15625 + 250 + 1 = 15625 + 251. So, the correct option is (iv) 15625 + 251. Class 8 NCERT Ganita Prakash ...